Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b5d7c121bbb04d…

MALICIOUS

PDF

93.8 KB Created: 2021-01-24 15:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c0118c051fed233974ce6a41e65ed37c SHA-1: ec70bd8c18269f1167137206dc97080e59b1f1ec SHA-256: c5b5d7c121bbb04dfaa61ab4b8dc99ce56ef70ed472fb7871752e8674f524fbf
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=forces+on+an+inclined+plane+with+a+pulley PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445869/normal_5fdc859161ee9.pdfIn PDF document text
    • http://donuliwobem.iblogger.org/gazajerexoruj.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/c0jd0gj/99247527618.pdfIn PDF document text
    • https://cdn.sqhk.co/mutexeze/ieihbhb/99349657706.pdfIn PDF document text
    • https://cdn.sqhk.co/biluvetizom/kRQgchj/39509025681.pdfIn PDF document text
    • http://freehookup.xyz/animal_crossing_game_evolutionp3cot.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/jijjUic/anonymous_chat_rooms_for_depression.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/LJSchjm/87793664574.pdfIn PDF document text
    • http://sayfelengs.space/towemugovipuvivokobugod2yv30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5fe99e6c12768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382429/normal_6004c129e7934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408862/normal_5fe238fe96a13.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesijoja/cgehb7k/86831523422.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widuxetikos.epizy.com/wugitilanetuvisotizamu.pdfIn PDF document text
    • http://dewelimu.epizy.com/wefiniropapitutifup.pdfIn PDF document text
    • http://wokeben.epizy.com/bebitoruki.pdfIn PDF document text
    • http://xivobotaxonid.epizy.com/lowosa.pdfIn PDF document text
    • http://sovizaz.epizy.com/gutijazopaj.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_off00013012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13012 5312 bytes
SHA-256: c8707fa0a923bbeb907a4db008e32b0c41d0d0a2fa473ef4f47b7d85bf05ba2c
font_01_sfnt_off00014232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14232 11560 bytes
SHA-256: 5018aebb1c3ef19ec0093be7c383a744db12c26b6169d38b71101723470c1c00

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