Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57bc716c57ec3d1…

MALICIOUS

PDF

70.5 KB Created: 2021-02-12 11:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: df1f27a52a5915d1326df37ab3d03077 SHA-1: 6ca130e5949661de505d9ce0904cbf7e6ba695ad SHA-256: e57bc716c57ec3d1cd69446acd269b6740767dad787cbfc1f4e1eacf062b556e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of URLs like 'https://maypoin.ru/123?utm_term=wileyplus+accounting+answers+chapter+6' indicates a potential lure for users seeking specific information, which then redirects to other potentially malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=wileyplus+accounting+answers+chapter+6 PDF link annotation
    • https://xixolediz.weebly.com/uploads/1/3/4/5/134513169/suxuxog_xujizuju_mirapowozut.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/jjjhjhh/starfall_learn_to_read_app_store.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5fd5f77eda8a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_6021a37f119c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_600a592a9e2bd.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/jbijlhb/5204606129.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/CLifWpz/hakuouki_characters_relationships.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_600f91a84d9e7.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosinewok/TxF9geF/lingo_games_learn_spanish.pdfIn PDF document text
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/6178241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5fe227e0192d2.pdfIn PDF document text
    • http://kelepajalimax.iblogger.org/12685347007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorofij.epizy.com/jingle_bells_trombone_sheet_music.pdfIn PDF document text
    • http://retudazugo.rf.gd/finance_board_report_template.pdfIn PDF document text
    • http://nanesipub.rf.gd/15917165928.pdfIn PDF document text
    • http://nimunofat.epizy.com/61213926066.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_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 5556 bytes
SHA-256: 02ee6c2583694ca64c2ffeecd1bfd21ecd8d952bde6cbf77a65d7364267653f5
font_01_sfnt_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 11060 bytes
SHA-256: 8eb9bc627562cb56e74188a21d2d1c4ad7d63c9ca04ce03f6f6f11cc4d18914c

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