Malicious PDF — malware analysis report

Static analysis result for SHA-256 556346f792221357…

MALICIOUS

PDF

79.2 KB Created: 2021-03-26 10:24:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e08230e69efde55912936809cbfb5a8f SHA-1: 45cdf0169c677a0b71ff5b25877154b98bf5cf89 SHA-256: 556346f792221357d7675d9238bdd48b8fa4bec0991c4b10c49b884b4eb0425e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, appears to reference book titles, likely as a lure. The presence of embedded URLs and the overall structure strongly suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=rabelais+and+his+world+bakhtin PDF link annotation
    • https://cdn.sqhk.co/firokizita/fywnmgi/18963765177.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/hChj1Mm/4802398877.pdfIn PDF document text
    • http://stroiline74.ru/fovudexidivofozixerekzpfnk.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/ratoderarare_pekosede_wibisoxijupaza.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/ngiifh9/space_crew_game_guide.pdfIn PDF document text
    • http://lorenbayi.com/how_do_you_know_what_generation_kindle8vmlf.pdfIn PDF document text
    • https://vezajufarazigur.weebly.com/uploads/1/3/4/2/134265717/foninalupom.pdfIn PDF document text
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/mexinem.pdfIn PDF document text
    • http://24goodstore.site/osrs_barrows_guide_high_level6dnko.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/hfhVLgc/wobamojifif.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/8jifUhh/boston_college_football_games_2020.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://uploads.strikinglycdn.com/files/d5181bfa-dfe4-4a0e-96fe-93d9741dbe11/my_side_of_the_mountain_summary_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837fcc11-4a12-4c45-8d32-6b817b6ecb44/94247915687.pdfIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_2005795aef044671bbe249488625fe6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dee4e38-f75d-4e99-bbc1-40a23d42ea8c/wopoxen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7223995c-1255-4900-89c1-8d900cf5f785/46579643961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9af384-e6c3-4d59-bad1-e070487c8475/nuxamapunotumot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47515204-9fcd-403a-a876-8774cefeac40/numujadibutusiboxipewuf.pdfIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_fc322703911b4cdd81fefb67a0aa9f52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4c9521-f049-4ad5-becd-f7afadd66449/tifuxutakafisenuzuwafag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49fde2d1-b6f1-480b-8b64-20c6eb5100db/how_to_open_digital_sentry_safe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf4201c-6dd7-4741-9a76-5dc3c75c7f54/into_the_wild_timeline_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c492e6d-2e29-4f48-a2b9-ef9e674a41ee/4734048538.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 5004 bytes
SHA-256: cc541dde74ae32f5ffa7d4f647c61a1f63d3adbc05ac364f035c3538373de655
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 13420 bytes
SHA-256: 65fb3741e87dbce0d93319833cb2400de6efa9af95a6afc85cdc3aba2594f180
font_02_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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