Malicious PDF — malware analysis report

Static analysis result for SHA-256 df31ee73add50312…

MALICIOUS

PDF

78.1 KB Created: 2021-03-18 15:18:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c081d6f464387cc7fb16190fd9487aef SHA-1: 45c41080245706fde165a4ec5e11c8a4424c7b62 SHA-256: df31ee73add5031276a4007479fb623f48e3f40dc02b1963c1e0021ec6d7d8bf
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains references to 'mcpe 15.0 apk cepde net' and 'wkhtmltopdf', suggesting a lure to download potentially malicious software. The presence of external URIs and the link farm heuristic indicate an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://botokaw.ru/wix?keyword=mcpe+15.0+apk+cepde+net PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481403/normal_6019d2812fd1c.pdfIn PDF document text
    • http://crysety.xyz/gutagavuimhnk.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/cicYTFX/upload_video_to_youtube_from_android_you_tube.pdfIn PDF document text
    • https://cdn.sqhk.co/ragekasa/xhjheid/masowetesapudi.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/rWha2Ts/army_toys_town.pdfIn PDF document text
    • https://cdn.sqhk.co/kinifukix/bxiiYN9/the_best_classic_rock_songs_of_all_time.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474206/normal_60026124e1401.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/Fkyjuij/galaxy_alien_shooter_mod_apk_hack.pdfIn PDF document text
    • http://cardioactiveufficiale.site/what_does_the_phrase_peace_offering_mean4ixub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490539/normal_60226bf2ddc59.pdfIn PDF document text
    • https://cdn.sqhk.co/besuduxikuvo/bkAggjj/assessment_year_2016-_17_itr_forms.pdfIn PDF document text
    • https://cdn.sqhk.co/zomulusiku/heijtig/converting_fraction_to_percent_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/iijehaa/olx_online_quran_teaching_jobs_in_lahore.pdfIn PDF document text
    • http://fresh-ita.fun/952259431937zhm9.pdfIn PDF document text
    • http://neuroncraft.online/prepositions_worksheets_with_answers_for_class_9vzi83.pdfIn PDF document text
    • http://morpeoplelife.ru/92985040173r2nfg.pdfIn PDF document text
    • http://kkkirrreeee.space/spiritfarer_fat_for_fried_chickenaqw5s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450345/normal_6053337115884.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/50cde09e-c00c-40ac-abd2-99e4fbb7492b/fomididifebowujibapepibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62c7ffb-e101-42d9-a004-a2629c6924df/spalding_basketball_hoop_spare_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c99adb5b-8ab8-4ae4-9213-37d8a20fcbe6/what_are_the_types_of_curriculum_innovation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf1f51e-889f-489d-b803-a2cf78ec0063/how_to_become_a_psychologist_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78850c46-6023-4b17-a5fb-417b83a6a46b/thinkorswim_tutorial_options.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 5180 bytes
SHA-256: a72c0a044f4f6fd87542332e9eaaf5d1fdb29cdf7477d29144436a242122cdf1
font_01_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 12084 bytes
SHA-256: 58b4b2c75f62239c1583fcfd2de6ddbcafa10a02095cedc87054dd3efc98bdb2