Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c5fc7fc6c4a49e…

MALICIOUS

PDF

76.3 KB Created: 2021-04-04 10:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3dbae686a4e6bc74f5c276c65dda1f63 SHA-1: c711844dfd0ccd15b4a0c2896ad29b4a41a17b66 SHA-256: 11c5fc7fc6c4a49e3c3e9ef8f0ce938f4dfa68fdffd16efab44bbe1fbf948258
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=matlab+plot+line+between+two+points+3d PDF link annotation
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/8756588.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/hhhdGgf/electrician_apprenticeship_rates_ireland.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/hgRheCq/gipafudegaj.pdfIn PDF document text
    • https://cdn.sqhk.co/zepigelona/jjJfjid/raxeni.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/iCujbia/xagevuvotamiwavogugagi.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/gh30hfJ/kaweduravozukenilubuni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389384/normal_5feb0656eba82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_605aa926f2249.pdfIn PDF document text
    • https://cdn.sqhk.co/xizaxulubezu/chjFEUe/best_new_caption_status_for_facebook.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/james_forshaw_attacking_network_protocols.pdfIn PDF document text
    • https://xobugozo.weebly.com/uploads/1/3/0/7/130739897/bedb229f24e27.pdfIn PDF document text
    • https://zolowokixo.weebly.com/uploads/1/3/0/7/130738875/3620fcbb75b06.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/xodituxajinamikeve.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/gibigI1/tuvotut.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxogafu/jjibgiP/notetodo_note_to_do_list_app.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/bPiiYQc/vufeko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_dc2ee7dd87174cd08e68f6ac89d67737.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_271eba3494f842dd80aa11a9c70fbac0.pdf?index=trueIn PDF document text
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_8f3c1c318e2149a2aa468ab625289baa.pdf?index=trueIn 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_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 5260 bytes
SHA-256: a4e085f375441052a7c58b9c665b15304bc9922be1a79a08df64783b7700226f
font_01_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 10720 bytes
SHA-256: f09b701c9c25380195b4cea866f35a6fd162bad7e4751dc9bab3fd8da129ec9b

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