Malicious PDF — malware analysis report

Static analysis result for SHA-256 175ff8cb7ea57b47…

MALICIOUS

PDF

73.1 KB Created: 2021-06-02 18:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1764c212ebcde1f4502c7642ee263087 SHA-1: ed1e1394f2bb70bc313da54ec72133ebe507f616 SHA-256: 175ff8cb7ea57b477a32df539ec0670a5f7f5bb7dbd44e039fb0459dc0c3043f
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm or SEO spam operation designed to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, appears to contain search-related terms, reinforcing the lure to external 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://archism.ru/pbw?utm_term=what%2527s+the+best+car+seat+stroller+combo PDF link annotation
    • https://sepowutidogotov.weebly.com/uploads/1/3/7/4/137499397/sowev.pdfIn PDF document text
    • https://jidukuroji.weebly.com/uploads/1/3/4/0/134013204/dumululajixitu.pdfIn PDF document text
    • https://nekazadezi.weebly.com/uploads/1/3/4/6/134662300/bolatixuf_rafutofutoko_rukewunet.pdfIn PDF document text
    • https://daxozeke.weebly.com/uploads/1/3/4/3/134322415/3008560.pdfIn PDF document text
    • https://burodinijosago.weebly.com/uploads/1/3/0/8/130813714/vojakafezep.pdfIn PDF document text
    • https://kukotefuses.weebly.com/uploads/1/3/1/6/131637352/febiti-nidejumena.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/439d8.pdfIn PDF document text
    • https://radiduma.weebly.com/uploads/1/3/4/3/134362755/ac095fdba1e29c9.pdfIn PDF document text
    • https://setoximusekaz.weebly.com/uploads/1/3/4/7/134714347/3181371.pdfIn PDF document text
    • https://xakepimefinawam.weebly.com/uploads/1/3/4/9/134903333/jafazonuz.pdfIn PDF document text
    • https://bopifodefow.weebly.com/uploads/1/3/4/3/134383970/2304c3432c425.pdfIn PDF document text
    • https://zagogomok.weebly.com/uploads/1/3/4/3/134350094/jabutitejegix-pikipuguwig-sukixupufiteze.pdfIn PDF document text
    • https://mamulexujixi.weebly.com/uploads/1/3/5/3/135390653/332aa061bf.pdfIn PDF document text
    • https://vajuwapokovis.weebly.com/uploads/1/3/4/3/134361820/zuvukezufa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tazijebep.pbworks.com/f/which_letters_are_ascenders_and_descenders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5b1d3c-ef48-445e-8ba6-b2ba12a0349f/80810776511.pdfIn PDF document text
    • http://morabef.pbworks.com/w/file/fetch/144450813/teacher_portfolio_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf6eb79-04b5-4654-95e8-5f19701828b2/51048812372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d855e5b1-5e33-4749-996d-cae6b7c299d7/mizawobadatene.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_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 5224 bytes
SHA-256: 59dfe8ad134a93253dc9b59adc52cd06037c810dd6dcd2ab5beedf0da2466b8f
font_01_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 10100 bytes
SHA-256: c026dcf705f7190f8aab71ad05298b05d574d9f6ecba98edd301fea85cea2508