Malicious PDF — malware analysis report

Static analysis result for SHA-256 b826e945a165d54e…

MALICIOUS

PDF

69.0 KB Created: 2020-11-13 22:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8bdeffc750d11dbd69384d1c027d4871 SHA-1: 2d68178b31642160021298c7ac6c135d2dea5373 SHA-256: b826e945a165d54e6b189ce1180805f6529b6f0ff50fcef4693666f6060a1911
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 0.9997

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://traffset.ru/123?utm_term=game+of+thrones+conquest+cheats+2020 PDF link annotation
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/5a6f19fa768b88.pdfIn PDF document text
    • https://wagofokixe.weebly.com/uploads/1/3/4/6/134694124/gekufedixotenax.pdfIn PDF document text
    • https://fububekamuko.weebly.com/uploads/1/3/3/9/133986391/tamufudereluzod-pefami-xaxapezisaj.pdfIn PDF document text
    • https://xirofepomare.weebly.com/uploads/1/3/0/8/130814083/fijopunidivarejesuje.pdfIn PDF document text
    • https://vejesare.weebly.com/uploads/1/3/4/4/134493146/kivewimepoju-mikeluf-soxudokebusi.pdfIn PDF document text
    • https://relitemora.weebly.com/uploads/1/3/4/3/134352419/8898637.pdfIn PDF document text
    • https://gusabowusido.weebly.com/uploads/1/3/4/6/134652741/towajisufivokig.pdfIn PDF document text
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/lefokoke.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/lapikafalipafon-mexagutowikufu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/84896e38-52b8-4eee-b217-acf282d667c7/finite_and_infinite_games.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/66854289154.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/59601503100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2b36d2-72ca-4c02-b3b3-33798d05054d/sewenarivemamuzobonole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a250708b-6279-436e-8e55-379e78479bd4/6146102504.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD4 5520 bytes
SHA-256: b8eb2dacfa124a0387c09ad293fdf8e907452c8518075ae10f6648c71b5a9e0e
font_01_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 10924 bytes
SHA-256: 85f37aa7c734b39088644fdf59dd5e60bd59e79f8d7484a1f04b0ecb8cd69692

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