Malicious PDF — malware analysis report

Static analysis result for SHA-256 47bf5826a03ee9ae…

MALICIOUS

PDF

79.8 KB Created: 2021-02-28 09:14:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f32be77c023ab542b4e70efccbd0e1b2 SHA-1: 2278417e6d09b6760ccc5331acdcccf98e51925d SHA-256: 47bf5826a03ee9ae5e45e0b099ac06d6d96747d5d221471e7a46ab45c23e2483
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and references 'Fallout 4 companion perks worth it', likely a lure to attract clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://midufefew.ru/123?utm_term=fallout+4+companion+perks+worth+it PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412780/normal_5feb995f01527.pdfIn PDF document text
    • https://tefeteti.weebly.com/uploads/1/3/0/9/130969297/f2791708.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367940/normal_5ff29e7e1da66.pdfIn PDF document text
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/796a4.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/9700967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426085/normal_5fdbf77f3d37b.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/dlUhajg/tetris_99_switch_how_to_play.pdfIn PDF document text
    • https://cdn.sqhk.co/takepoladev/FPohegc/short_romantic_love_letters_for_him.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/sixixekape_mefawomajo_gasutakutawanak_figubejoxata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376599/normal_5ffdb47480f05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_602d314f508d1.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/fvl7jbU/86748017556.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/zotinajugenigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_601f34943dfd8.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/7xmiggd/gukubomejegodenoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ratobewiwigu.atwebpages.com/takigavumisejesegiz.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_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 5372 bytes
SHA-256: b76ad60ad2a0d229a252ecb6c51360552adefdc590409ef418b26fab65950074
font_01_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 10692 bytes
SHA-256: b90b343da4219ae428cb4a145e1e32959c7ee189cb80700fc8b94abdf5aa75dc

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