Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3b333190852ad0…

MALICIOUS

PDF

79.9 KB Created: 2021-05-29 12:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4914e6330716ba9de5b170d2cf58421f SHA-1: 400ac6640fa8e3c85854bd71625dc213ac6e2dfb SHA-256: aa3b333190852ad025c3442297e0a0ae08e4b7361467159578ec78d51cce477e
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-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://dafemum.ru/123?utm_term=12+to+24+hour+time+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485446/normal_6044dafd205bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_605b1fafe38ec.pdfIn PDF document text
    • https://xebagamalod.weebly.com/uploads/1/3/1/3/131383607/gugizuroziki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_5fd60f844e15d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478132/normal_6020d02f103dc.pdfIn PDF document text
    • https://talibixakezadep.weebly.com/uploads/1/3/4/5/134590085/refer-kugewubatufuto-rebej-libug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413122/normal_5feede651a831.pdfIn PDF document text
    • https://padikolejak.weebly.com/uploads/1/3/4/0/134042397/dafuvirozo_sugafozobar_vipavesabadixu.pdfIn PDF document text
    • https://bopifodefow.weebly.com/uploads/1/3/4/3/134383970/batupotukixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482399/normal_602ae6f7c5ffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_603a7784526ce.pdfIn PDF document text
    • https://waderiraxobo.weebly.com/uploads/1/3/4/5/134505054/9050913.pdfIn PDF document text
    • https://wadaxoleda.weebly.com/uploads/1/3/5/3/135311928/ribopivibuvagaroki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5fe9da9fc1e52.pdfIn PDF document text
    • https://xedafiwiwez.weebly.com/uploads/1/3/2/3/132302754/6008707.pdfIn PDF document text
    • https://mulibini.weebly.com/uploads/1/3/4/8/134881685/2620161.pdfIn PDF document text
    • https://kowuzuworos.weebly.com/uploads/1/3/2/6/132682574/famasag_zematulutalizod_bukixuviwoseta_luxovox.pdfIn PDF document text
    • https://sifudalumavobu.weebly.com/uploads/1/3/2/3/132302711/033545c1ff0.pdfIn PDF document text
    • https://dowabibagugodu.weebly.com/uploads/1/3/4/6/134697665/fac2a65.pdfIn PDF document text
    • https://nidozasa.weebly.com/uploads/1/3/4/6/134680612/2586009.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459645/normal_5fcb3f570c500.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 4972 bytes
SHA-256: 44d8b64153ce8594fbe388d6b8827beabbdab6bc685501a529a547fcf73cf791
font_01_sfnt_off00010e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 10712 bytes
SHA-256: 201afc4b977dd284aabb1ae750418b1d20c3b545674501661aa60b9a72b42254

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