Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8dfbdc29b426cd…

MALICIOUS

PDF

71.5 KB Created: 2021-02-20 07:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 662a8268a6c88c623ed28824f73761a0 SHA-1: 28b285a07bc557132c0d0fff59c3aade2443b553 SHA-256: aa8dfbdc29b426cd48801e1785f1d845b9fc8f30ff1040622e0e8a04196bb95a
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://seumenha.ru/wix?keyword=subordinating+clauses+worksheet+ks2 PDF link annotation
    • https://kazubuxupopa.weebly.com/uploads/1/3/2/6/132696048/volareje-niziku.pdfIn PDF document text
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/losujevuzoj-tabosuvomoz-kemesujuma-vunuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_602d02dcc6961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_601db908b5e4f.pdfIn PDF document text
    • https://nokaroropufut.weebly.com/uploads/1/3/1/4/131453144/puxuxalusipekiz.pdfIn PDF document text
    • https://gesamuju.weebly.com/uploads/1/3/1/4/131453574/talozawutires.pdfIn PDF document text
    • https://daxexamuve.weebly.com/uploads/1/3/4/4/134446800/0ff201fb41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5fd1cea54aa8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459182/normal_5fe53d5bc8848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_6011b64c79910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414515/normal_5ff9bb9e2e4c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5fd34f241da0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381788/normal_5feb593e6ea48.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
    • https://s3.amazonaws.com/jefazaxal/2018_bmw_x3_xdrive30i_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/doponuxeder.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/gitlab_ci_template_script.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/battlefield_2_bad_company_update.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_off0000cd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD04 5612 bytes
SHA-256: ada6187a5f3e9a886fb5e1f1e057fa3b802d81dbefaf0639abe0203ae1a40e25
font_01_sfnt_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 10180 bytes
SHA-256: a108a1f4960c49efa220bef2349202dc2a6cc486ba8125177ba23cc63ad5d60c
font_02_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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