Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1ebff25d2a5b65…

MALICIOUS

PDF

74.9 KB Created: 2021-03-27 18:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d96d8d74abf40c29a3298d52c60106da SHA-1: 2441c71273c40f22f888193f978824c69f4f47a2 SHA-256: cf1ebff25d2a5b654a407bced2dd55ee8513b6df1a487f63a242537aaabf8251
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The PDF_SEO_LINK_FARM heuristic indicates a high volume of links, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. While no scripts were explicitly extracted, the presence of numerous external links and the overall structure strongly suggest a phishing or malware distribution vector.

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/wix?keyword=echo+reservoir+utah PDF link annotation
    • https://cdn.sqhk.co/favosejo/pQibjik/adventure_communist_hack_apk.pdfIn PDF document text
    • http://trychambre.xyz/what_stocks_to_buy_for_a_beginnersazyle.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/pelulilil.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/60259720207.pdfIn PDF document text
    • https://sokotomajav.weebly.com/uploads/1/3/4/0/134040389/wagaviwoz.pdfIn PDF document text
    • http://future-techno.ru/aj_hack_no_surveyqhws3.pdfIn PDF document text
    • https://cdn.sqhk.co/fepefudasor/iamniiJ/29359572747.pdfIn PDF document text
    • https://fufaguda.weebly.com/uploads/1/3/0/7/130739251/nuluni.pdfIn PDF document text
    • https://wowererifawop.weebly.com/uploads/1/3/1/3/131384429/zakilemoderened.pdfIn PDF document text
    • https://sikevitexin.weebly.com/uploads/1/3/5/3/135301450/wipawugeketo-fesaji.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/libro_de_jaser_gratis_en_espaole5a3z.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/assertive_communication_book.pdfIn PDF document text
    • http://meriline.store/287042869919yw2u.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/6Yxaz2Q/76439112895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zagubip/food_handlers_card_answers_wv.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/what_does_ellipsis_mean_in_python.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/shadows_in_my_room_song.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_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 4872 bytes
SHA-256: 3d8c06041d8cbb74904c784a5666d76307571bdaced271ffa8ac5551856d7815
font_01_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 11676 bytes
SHA-256: cd0bc966486af06536447a7c5d2d827136f47e82689551216862f1db3de5a419

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