Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17461dfb03f0d5b…

MALICIOUS

PDF

87.1 KB Created: 2021-03-09 17:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b86964a4f4edf953175eb38aa88668bb SHA-1: c953c109e92806590ee763df34b59098e377ed6e SHA-256: f17461dfb03f0d5bd84715703d290adba9ee12ab2d6aabb999b98564e9d4f1c6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware or phish for information. The document body, though heavily obfuscated, contains text related to calendar downloads, aligning with a lure for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/award?keyword=shri+mahalaxmi+calendar+2020+pdf+free+download PDF link annotation
    • http://xidufefonudug.sportsontheweb.net/27690978606.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/Bia5zji/learn_to_read_music_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/ihbjhgf/cover_fire_offline_shooting_games_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/Puhb1jf/70568314050.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/in_what_ways_did_education_change_during_the_1920s.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/gelqgiS/52249803926.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/VvQQgg0/jaropeju.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/2bMtsif/27826428744.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/9yhcnPk/launcher_hb_turbo_irons_headcovers.pdfIn PDF document text
    • https://cdn.sqhk.co/migixurej/hcgggiX/calendar_2021_with_holidays_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/ihjiggi/tutorials_teaching_teach_english_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_8994cfc8734a4b4ba4bb624290ad8948.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_fc41a42235a34b7cbede64425c5f1f99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f35053-be9d-4b65-b374-9e2f5badeb6f/xukanageloji.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_e59280e4520347d397e2a7b392dad1ff.pdf?index=trueIn PDF document text
    • http://luzawuwu.epizy.com/kokutajafarijubenenewapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d491b5-2b32-402c-877c-b8da3898b50e/are_speakers_waterproof.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_42145c363d464977baa57f2d0d4079c6.pdf?index=trueIn PDF document text
    • http://pamiduzaluwo.epizy.com/ketirexiluxebufodot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd0552c7-44f2-43af-afa5-a7fbf5be10ac/python_programming_tutorial_basic_advanced.pdfIn PDF document text
    • http://xiwexuxe.atwebpages.com/8099253411.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/what_are_the_2_types_of_outline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c88298-639b-4a3d-931f-5c462a05f28f/jaburofi.pdfIn PDF document text
    • http://rofuvawitarul.atwebpages.com/wong_and_law_emotional_intelligence_scale_questionnaire.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_7be94dafa5114dac8675c6c468bda131.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 5464 bytes
SHA-256: 064f4f050956948f7bb53a403696bca730606867f24385fe769a9937e9a99169
font_01_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 10184 bytes
SHA-256: b659f6ea725ac51a4ec5c7cfcee9ea5e2121851051ee9b05d44950428bf97dc7
font_02_sfnt_off00011c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 16172 bytes
SHA-256: 7f268005b80ff82e89639affb95403f55eddb42516abbde6a76e27226db124cd
font_03_sfnt_off00013148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13148 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_04_sfnt_off00013f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F48 3084 bytes
SHA-256: ea2b9cadee839ca0e4ab193c363bce9ac188defe3bf3a9df16cadb779db1b36d

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