Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36400035c04308a…

MALICIOUS

PDF

37.5 KB Created: 2020-03-31 01:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fcae97b59811c79b82abc5e4d56a166a SHA-1: f25582a21123c7292e1e6df518d81f444cbdf5a0 SHA-256: b36400035c04308a70ccb4434fe6fea5d5b2054165feba2284b1bbed1b01ef8b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a dropper. The document contains a large number of external links pointing to PDF files hosted on various domains, suggesting a link farm or SEO spam operation. The primary purpose appears to be directing users to this network of sites, potentially for further malicious activity or to inflate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-9251873-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9251873-0
  • 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 http://nordicactiongroup.com/uploads/1/3/1/3/131379163/131379163.html#ejemplos+de+uso+de+formato+condicional+en+excel
    • http://addisonmoher.com/uploads/1/3/0/4/130483265/ac0fd11207329.pdf
    • http://contemporarypublishing.com/uploads/1/3/0/4/130435503/rozatubejatose.pdf
    • http://movingmindsdance.com/uploads/1/3/0/5/130590186/62521e4e497d12.pdf
    • http://intersexjusticeproject.org/uploads/1/3/1/0/131070458/17bc8dae9bb13a.pdf
    • http://sarahvitale.com/uploads/1/3/0/3/130379466/xowadesi-zuror-kagin.pdf
    • http://westvanlandscape.com/uploads/1/3/0/7/130775372/jepokizofu_gegixolififasa_sevuk_vinenad.pdf
    • http://remnantstudios.com/uploads/1/3/1/4/131437722/9987276.pdf
    • http://leakdetection.info/uploads/1/3/0/9/130969090/5824ed388.pdf
    • http://elizabethlopez.net/uploads/1/3/0/6/130604541/fozafibodebiwi.pdf
    • http://stradvocacia.com/uploads/1/3/0/2/130272339/8024610.pdf
    • http://leroybusiness.com/uploads/1/3/0/5/130550818/6102450.pdf
    • http://buckassassins.com/uploads/1/3/0/5/130538959/921506.pdf
    • http://drbobhospital.xyz/uploads/1/3/0/7/130776629/07b37.pdf
    • http://pikkoli.com/uploads/1/3/0/7/130775831/5f1c06d25fd79.pdf
    • http://aydinscloset.org/uploads/1/3/0/5/130551401/jekosizugab-dusoxejesi-sonuwa.pdf
    • http://mylittlemissprissjewelry.com/uploads/1/3/0/7/130740011/makes.pdf
    • http://aservingofsantosha.com/uploads/1/3/0/4/130476624/27fe7bc3.pdf
    • http://bartleytempleumc.org/uploads/1/3/0/5/130589000/jinediredubivu.pdf
    • http://aquariumsalesandservice.com/uploads/1/3/0/5/130550937/rutefofug.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066a6.bin
6ae33b4f33b91c0dc2845589f334378a53e9d95f06431d0fbb20163fa2d46457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A6 8712 bytes

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