Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b7d612a88c1fc3…

MALICIOUS

PDF

60.7 KB Created: 2020-11-26 01:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fd9c6815c55ed21766acdec850e790ee SHA-1: 9a93f9bab8be6ff93bb11277e931f94f2e66d1e3 SHA-256: 85b7d612a88c1fc3a01a4603a9fd7a9202117e1ee441caf554de1233fee31bfd
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 0.9996

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://traffnew.ru/strik?utm_term=tsukineko+versafine+clair+color+chart PDF link annotation
    • https://jefogozadiz.weebly.com/uploads/1/3/4/0/134040800/pituxakixawul.pdfIn PDF document text
    • https://sulidisige.weebly.com/uploads/1/3/4/3/134318683/2344139.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/84cb85d71866dd2.pdfIn PDF document text
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/5460064.pdfIn PDF document text
    • https://juzowugaf.weebly.com/uploads/1/3/4/7/134773334/bekunejexawerokiz.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/e1d84cd9c07f.pdfIn PDF document text
    • https://gunoserikufetof.weebly.com/uploads/1/3/4/3/134360264/dulanikaganotadital.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/xovefirebe-dikuxepixazo-lovojulobena-perugusopi.pdfIn PDF document text
    • https://zavegaligap.weebly.com/uploads/1/3/4/4/134499553/midex_sizawezapez.pdfIn PDF document text
    • https://masogipu.weebly.com/uploads/1/3/1/6/131606875/8050757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5fadf8c0807f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/28921575172.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/belavibikunosamubufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/823cb21d-e698-450d-b4bf-6865ad78faed/financial_accounting_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a04fe1a-ce0d-480b-825f-83f4c2f5f772/mole_ratio_worksheet_consider_the_chemical_reaction.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_off0000b2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FD 5040 bytes
SHA-256: cc84c257f624e5708af684e2cdeb9a26e2b907defbfddfe75fc59c27d65a1773
font_01_sfnt_off0000c426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC426 9792 bytes
SHA-256: 0ed3405a28b83123d4fcf98975ac282bfa41ebb35deb062e1738d867f80e4272

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