Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf35e712fcdf548…

MALICIOUS

PDF

80.9 KB Created: 2021-02-06 21:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 246b0ee460ee82fd7bad42e118259548 SHA-1: 013a7a79c589ff0dcbe391ea2ec7f7082f59f8b4 SHA-256: 5bf35e712fcdf5486018ae880ede12e0c5ba02b62bf746cd2eced2b945c41aee
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV as Pdf.Phishing.Trojan. The embedded URLs form a link farm, with several pointing to known malicious redirectors or disposable hosting, suggesting a phishing or malware distribution scheme. The document body contains garbled text, indicating it is not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=house+with+a+clock+in+its+walls+book+vs+movie
    • https://japapitamamevoj.weebly.com/uploads/1/3/2/7/132740309/8179543.pdf
    • https://dilozerekake.weebly.com/uploads/1/3/1/4/131452754/6105463.pdf
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/3263342.pdf
    • https://cdn.sqhk.co/masunidupag/hbcrhjN/gafeki.pdf
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5fd0859facab5.pdf
    • https://cdn.sqhk.co/kinibemazoz/CZNiaih/mafob.pdf
    • https://rojaduvesasesa.weebly.com/uploads/1/3/4/7/134751848/fufokamumomofibudi.pdf
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/8965260.pdf
    • https://cdn.sqhk.co/jobezivozuf/fUonQQT/81190485491.pdf
    • https://xojovirasada.weebly.com/uploads/1/3/1/6/131637125/5757968.pdf
    • https://cdn-cms.f-static.net/uploads/4486521/normal_6014cee4bd76f.pdf
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/vozoregewezisove.pdf
    • https://cdn-cms.f-static.net/uploads/4411932/normal_6016f06df069d.pdf
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/15100.pdf
    • https://polalakenasi.weebly.com/uploads/1/3/0/8/130813885/jitasezedidoxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/webipejonavuv/bofisotugofagejenusup.pdf
    • http://timadulikojig.rf.gd/sujatofadotakobasulokefej.pdf
    • https://s3.amazonaws.com/pirofopafu/38163746508.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e8.bin
9caa7736d1e38a25ce7ec5b3a11684df3c4559d445bac60a7ab48b0a09cab859		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 3208 bytes
font_01_sfnt_off0000fc5a.bin
379a473fa78092f34f663ace4af629493eeaf91c29f7d4da32fa725af37f301d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 5260 bytes
font_02_sfnt_off00010e30.bin
0102f5919108e5dc46f24890b326feac28e529f81d589556bfea4dd299383bfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 11608 bytes

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