Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f66f9bdb935184c…

MALICIOUS

PDF

79.2 KB Created: 2021-02-11 05:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0547d59f265e9e72cc82c5e0fc20781c SHA-1: 7aebf9d04926b5e8d2aa86fb20d103449d7337d4 SHA-256: 9f66f9bdb935184c365f3e98e1c1698b2a4a20c9fe61bab7956b1d65f0901591
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. The presence of URLs like 'https://maypoin.ru/123?utm_term=learnerator+answer+key+pdf' further supports the lure of an 'answer key' to drive traffic to these sites. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

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=learnerator+answer+key+pdf PDF link annotation
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/bbec6.pdfIn PDF document text
    • http://fherixq.com/lejidivojosazawekibobo73ex7.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/dewezagufaxajeguweje.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/panixipumigi.pdfIn PDF document text
    • http://mavurelaro.22web.org/apple_airport_extreme_router_manual.pdfIn PDF document text
    • http://endi-itali.space/strawberry_09_word_cookies_special_levelaaopq.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/0f7c3a5ca3e.pdfIn PDF document text
    • https://legupapepunune.weebly.com/uploads/1/3/0/7/130776309/xevijute.pdfIn PDF document text
    • https://tisegibak.weebly.com/uploads/1/3/1/3/131380339/powebatagik.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/iviyjbL/fanezuwij.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/60225666947bd8la.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/jajadatutodiko-pemafip-sipoga-wigonuwet.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
    • http://zinimivozu.rf.gd/xazodisixupefilixedelawub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 4944 bytes
SHA-256: 640c0785575f9e80362fc999beea16ece7a8cb879210a2bb4fb2116bd1e389ce
font_01_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 10772 bytes
SHA-256: 6a79c9ffef2f4178fe3aa12e87b8412bfe9749001198c68e67dae049a8602ee8
font_02_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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