Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2a8f24b629fe05…

MALICIOUS

PDF

80.6 KB Created: 2021-02-25 06:27:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fce9ca2ec0ff593e1aa9a9b6e328db33 SHA-1: 5b7b8bf4d13293703ce44470a29b348ee9e48e19 SHA-256: af2a8f24b629fe05d97fb9680096ff728e2998d4c68f6fb4a2c5bcc450c52e6a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://baarspo.ru/123?utm_term=docker+cookbook+neependra+khare+pdf PDF link annotation
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/1ada20abbd153.pdfIn PDF document text
    • https://sujumakatu.weebly.com/uploads/1/3/1/3/131379709/2029503.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_5fcf7e04e6b80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402724/normal_5fcf25c7b4fef.pdfIn PDF document text
    • http://shopsmmv.site/practical_file_index_pagec4x5t.pdfIn PDF document text
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/dakufedagataranutad.pdfIn PDF document text
    • https://xukotonaxi.weebly.com/uploads/1/3/1/4/131453431/botefanejibegarija.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380523/normal_5fecfd038e8cd.pdfIn PDF document text
    • http://xavubizuj.22web.org/9_news_fortnite_report.pdfIn PDF document text
    • https://ranazujip.weebly.com/uploads/1/3/5/3/135398887/6964880.pdfIn PDF document text
    • http://bilkan.fun/what_is_sun_rising_industryx8yko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486534/normal_601b066bc03cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465277/normal_5fe45b7d9d922.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xepazap.epizy.com/t_h_o_full_form.pdfIn PDF document text
    • http://zoxizagujaniru.epizy.com/80682822802.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 4896 bytes
SHA-256: d73ab7052593e634e9e42de247809845ea33e07f7fd9b8aebd77a053621a702b
font_01_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 11240 bytes
SHA-256: 49471f2bf79f6ca29cf7f5e751c89c87fae9247cb0c3d71c670d94d906c91405
font_02_sfnt_off00012779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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