Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3d7df4d83aee56…

MALICIOUS

PDF

106.8 KB Created: 2021-03-16 08:28:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fb1080206a41d56061370adf7306287d SHA-1: 272dcb2d4e47080e0e22a71b52b78fddd6f9d88f SHA-256: bb3d7df4d83aee56dcd54c38aad961e19b4884f7bc5808215a8200140ec0a5f8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm designed to drive traffic to potentially malicious or spammy websites. The primary URL observed is https://seumenha.ru/award?keyword=manual+de+kinesiologia+aplicada+pdf, which appears to be a lure for SEO spam or phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/award?keyword=manual+de+kinesiologia+aplicada+pdf PDF link annotation
    • https://cdn.sqhk.co/mifigatira/gisjdqr/zibunupifulib.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/YjchaUU/century_arms_c308_magazine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_604802379bdfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_603071b66624f.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/jek3jhF/tractor_pulling_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/wevemugas/jaut7ii/lujeroboxigo.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuvimavofo/ijTibEf/55144554406.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/ghajdXM/farming_simulator_14_cheats_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/hbjhijZ/board_games_for_5_year_olds_target.pdfIn PDF document text
    • https://cdn.sqhk.co/genibesarizi/fUiegjf/arguments_for_absolute_freedom_of_speech.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
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_0e2c373aae504b83bc3dbdd0253316f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazutun/possessive_adjectives_exercises_multiple_choice.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_85e7ceab3d3a4ebcb3d7833dc71e09b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/poisoning_treatment_guidelines.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_38d401719f684a9ea18c9f69c7b470a1.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_d11ccefbb89a479d957e852b8ef50dc6.pdf?index=trueIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_60266a5864574965917d140d6170cca7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/an_introduction_to_applied_linguistics_second_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/how_did_alliances_help_start_wwi.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/healthy_food_guide_australia_chicken_curry.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/kuveze.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E50 5096 bytes
SHA-256: 0293b66eb0479cfd48c20d586cbd30cfd494ed4032121eb68da6b9957bb5aea6
font_01_sfnt_off00014fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBA 13016 bytes
SHA-256: c70583320f2461855249b81389e31cbbf832cc01a7914826d9a38b6a4c10f14b
font_02_sfnt_off00017939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17939 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
font_03_sfnt_off00018dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DD3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.