Malicious PDF — malware analysis report

Static analysis result for SHA-256 a495a0e247dcdb43…

MALICIOUS

PDF

75.7 KB Created: 2021-03-25 21:28:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37f41ffb83eb9daa597541e00ba9edfc SHA-1: 131856ed8b354dedecdce1c0299ba2bac9a769ec SHA-256: a495a0e247dcdb437af67ddef9d32cba35b9bf20cedbe5de971e9eee82ccddb1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The embedded links likely lead to malicious content or phishing sites, and the document's structure suggests it's designed to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=human+blood+groups+book+pdf
    • https://tilinonulubun.weebly.com/uploads/1/3/4/6/134614078/kirosimibigazofu.pdf
    • https://bujevajixa.weebly.com/uploads/1/3/1/6/131637668/6a50067e9.pdf
    • https://cdn-cms.f-static.net/uploads/4490720/normal_601a108ff4187.pdf
    • https://fililajivivumir.weebly.com/uploads/1/3/4/4/134456316/sizesowimaxos.pdf
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/9548218.pdf
    • http://zugemenelil.medianewsonline.com/93144340459.pdf
    • https://cdn-cms.f-static.net/uploads/4506200/normal_601bc75c0a1d9.pdf
    • http://dujegud.getenjoyment.net/31294511873.pdf
    • https://zakisegozazamig.weebly.com/uploads/1/3/4/3/134346543/9998951.pdf
    • https://static.s123-cdn-static.com/uploads/4366947/normal_5fc93ba6d76df.pdf
    • https://danodukuwen.weebly.com/uploads/1/3/1/6/131637043/teragiwuvemole.pdf
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/5894116.pdf
    • https://japatuxivavagax.weebly.com/uploads/1/3/0/7/130775167/7e93c6f2b1f1.pdf
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/9845023.pdf
    • https://gokotaxoka.weebly.com/uploads/1/3/4/1/134109163/dijepoduwepuvekuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jifaxonajipe.rf.gd/parts_for_oreck_xl21.pdf
    • https://uploads.strikinglycdn.com/files/1bd7e4e1-cce6-4b01-9b10-4096ef8bde73/pokatebirizimopujigogas.pdf
    • http://xafexepov.epizy.com/navy_regulations_mustache.pdf
    • https://uploads.strikinglycdn.com/files/b4ae7483-f699-4745-8393-dccb210661e1/wix_email_address_promo_code.pdf
    • https://uploads.strikinglycdn.com/files/76a7b8bf-ce34-4862-a349-6f66437c1540/rii_mini_wireless_2.4ghz_keyboard.pdf
    • https://uploads.strikinglycdn.com/files/bcbd63f3-2de3-4a45-9f12-6c071ffeafda/wurozisagirokisetorul.pdf
    • http://timarerovasezot.epizy.com/21964376359.pdf
    • https://uploads.strikinglycdn.com/files/2f154aee-0c6e-4fd9-a9bb-a4ba40b3c1b0/tasubezejutewabam.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8b.bin
8f1cd0abb37d7ac16887e844461e211503216c0d39b02173f4f8a5cd18cb520c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 5524 bytes
font_01_sfnt_off0000fd30.bin
31328fa32a740bdcd8f6cfb4c8af8057b98331167d724050f9a64b7a5bddc385		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 10712 bytes

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