Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef4711682466825…

MALICIOUS

PDF

78.2 KB Created: 2021-02-22 14:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 651de1c8fe7017cceaf0ca95a0438dd0 SHA-1: 80037c729800aa42f453d2bcb55e9826f2c6ac68 SHA-256: fef47116824668259b897315c480a70bbdb1c64ad88111b2d9e7ed6a81244b33
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/wix?keyword=the+functions+of+centrioles%252Fcentrosomes+include PDF link annotation
    • https://cdn.sqhk.co/gadewekunel/jj4lghl/82516099394.pdfIn PDF document text
    • https://cdn.sqhk.co/tozijizubu/jIhc9gY/best_game_streaming_service_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5ffeb536d8705.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/tidopob_kevazefup.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/7612080.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/jix1gfy/88065865226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404133/normal_5ffc3970c2b13.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/ifvLgeL/7471673814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455645/normal_602c6bb10fd96.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/njiaict/gevofanix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375195/normal_5ff635e5d7d68.pdfIn PDF document text
    • http://vetapako.22web.org/vadidekupopidixavup.pdfIn PDF document text
    • https://vodesaladamaju.weebly.com/uploads/1/3/5/2/135298616/8544204.pdfIn PDF document text
    • http://womotov.22web.org/xagewafefavu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419650/normal_5fcf6bfc5751a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://karajifaderiwow.epizy.com/poison_frogs_leaf_litter_answers.pdfIn PDF document text
    • http://panadokopejed.epizy.com/89222669065.pdfIn PDF document text
    • http://rukojipunuwupur.epizy.com/wurosowonija.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_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 5036 bytes
SHA-256: b020ece0e7eb458db8feae7ed88c8d9f55ebf1f633e473b5dca752556fb2de00
font_01_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 11428 bytes
SHA-256: 07703299ddfe48728dc38a6d29d1101504b0e81c8c76a6662a045319cbb0e649

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