Malicious PDF — malware analysis report

Static analysis result for SHA-256 b306b895d913ca4c…

MALICIOUS

PDF

82.0 KB Created: 2021-02-15 20:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 099f7685f7e8da3b4f456e52e4b0397d SHA-1: 15c8572d704797c16cca531b674d2f049dbd08cb SHA-256: b306b895d913ca4c94d1b031ef924336e5cd159ae71124158d8c9f90be37c737
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=eyed+tiger+moth+caterpillar+sting PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fc6d67f87875.pdfIn PDF document text
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/1882810.pdfIn PDF document text
    • https://titugujogimob.weebly.com/uploads/1/3/4/0/134017720/likupo.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/iaMa1vC/3d_wood_wallpaper_for_wall.pdfIn PDF document text
    • https://visorupa.weebly.com/uploads/1/3/5/3/135305290/vusumefosiperapap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494648/normal_5fca051c5896e.pdfIn PDF document text
    • https://midumelu.weebly.com/uploads/1/3/4/3/134341446/pubitutas-wagalevawo-gorewa.pdfIn PDF document text
    • https://wuvekodufunat.weebly.com/uploads/1/3/5/2/135298648/8305791.pdfIn PDF document text
    • https://gebobofivogaxe.weebly.com/uploads/1/3/5/3/135308574/2240116.pdfIn PDF document text
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/rusuxadafeji.pdfIn PDF document text
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/9675049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_60292d025e349.pdfIn PDF document text
    • https://cdn.sqhk.co/xewazezikufi/csgeytx/17845927304.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/buzarirerobenefexiraneb.pdfIn PDF document text
    • https://denupadifujufo.weebly.com/uploads/1/3/0/8/130813478/31a3c0b168d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_6027091dee5a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tumasun/91812476037.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 5332 bytes
SHA-256: 8850af1a59a7b511255fe8551741f49f8011d2ffbffb9316dd00fd657b7466da
font_01_sfnt_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 10776 bytes
SHA-256: f5e1a7efd1be564ed6e301b1c6f2e4f7f98a71dadd123dac5bba5a41dd9a49cb
font_02_sfnt_off00012cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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