Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c38993783a981c1…

MALICIOUS

PDF

79.9 KB Created: 2021-05-15 13:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9e8b8b6c9b24f61c5a0cfad49e2989dd SHA-1: 90ade4175b6032f92767246e1bdba7bb28d32647 SHA-256: 8c38993783a981c14bfb117e2b494e5fefe65f36024a97d069e30dcf69fc0390
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://dugedepap.ru/strik?utm_term=boye+sock+loom+instructions+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482645/normal_5fca4457e0fed.pdfIn PDF document text
    • https://wasefopepaseb.weebly.com/uploads/1/3/1/8/131856398/9e9f3b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5fd1369c66070.pdfIn PDF document text
    • http://chambreop.xyz/48157548132cuek1.pdfIn PDF document text
    • http://rankingcoach-seo.com/kifewomoguweburigetis78fbn.pdfIn PDF document text
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/2852155.pdfIn PDF document text
    • http://itasda.online/banevejavzyrkt.pdfIn PDF document text
    • https://dametubidino.weebly.com/uploads/1/3/1/3/131383661/3723055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_605cb83d235fa.pdfIn PDF document text
    • http://cenderaoriginator.com/best_self_tanner_for_dry_mature_skinuv0sq.pdfIn PDF document text
    • https://tigopovon.weebly.com/uploads/1/3/4/2/134235173/18a2ab9b989976d.pdfIn PDF document text
    • https://nenilinuda.weebly.com/uploads/1/3/1/3/131383514/gopokudarazageveru.pdfIn PDF document text
    • http://gipilunafa.iblogger.org/rockabye_remix_song_320kbps.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/bc424a420bd9f.pdfIn PDF document text
    • http://tekplafond.xyz/5.1.3_quiz_introduction_to_trigonometry30gf1.pdfIn PDF document text
    • https://xevowuzari.weebly.com/uploads/1/3/1/4/131437308/101162e55d98454.pdfIn PDF document text
    • http://hopecommunitynaz.com/poultry_house_plans_for_5000_chickensz83ks.pdfIn PDF document text
    • http://prizinsta24.online/28301405718hlzre.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolopanezodubun.rf.gd/71364594471.pdfIn PDF document text
    • http://leronusofawu.epizy.com/65040038723.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_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 5308 bytes
SHA-256: 7ca6db8b72b3042b77fbcad24bf508175d7e9fa47c88376f50af1d0eb3383283
font_01_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 11092 bytes
SHA-256: e07133f0dc57826b60021cf89d48bea144f34109112ddee2d497e03ed6382c8a

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