Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6f9d6bb5f78723…

MALICIOUS

PDF

74.4 KB Created: 2021-02-23 11:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3a3138cd73be9ec3f7587078b1e377b2 SHA-1: 3491347e9323d76077d40a4e06a8dfa687253d3a SHA-256: ed6f9d6bb5f78723f67027e8a869b1fd6930f9526640d8e628d8bea41cdf19c7
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-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://baarspo.ru/123?utm_term=cherub+baby+car+bottle+warmer+review PDF link annotation
    • https://xuxufidumexed.weebly.com/uploads/1/3/2/6/132681394/pukitiwireliga.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/3795970.pdfIn PDF document text
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/wubowusesevelareguf.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/5fbd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412897/normal_5fd8bd5d6ebd1.pdfIn PDF document text
    • https://fojinotumure.weebly.com/uploads/1/3/0/8/130874368/pufofenenurexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_5fdc363a4affe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_60176113822d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5ff51d84ca495.pdfIn PDF document text
    • https://tazowodogakog.weebly.com/uploads/1/3/1/4/131437711/fifodisufelowezasuk.pdfIn PDF document text
    • https://virixodebusetij.weebly.com/uploads/1/3/1/3/131383575/6244781.pdfIn PDF document text
    • https://joralonu.weebly.com/uploads/1/3/1/6/131607047/6374329b0.pdfIn PDF document text
    • https://rudetotupolukoj.weebly.com/uploads/1/3/2/6/132681245/segizukitub.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/059a16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465688/normal_5ff3b2aedac58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365553/normal_5ff90681d3405.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/261701f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 5160 bytes
SHA-256: 1d82f9ccd6c807111ff2f50d3bb386f3d20885aec964d08527245d2aae44da0e
font_01_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 9956 bytes
SHA-256: e41a6a8d7e04cdff0f22330e83cca549ed4e058597bf9a1a8977b5c98ce4fc0e

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