Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a1f596d66bf5e3…

MALICIOUS

PDF

75.2 KB Created: 2021-03-14 03:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b91ed2236658751554c27a3e7c31553a SHA-1: 5b806f9bec206d4eafaba268e6e4cd0904e95e97 SHA-256: e9a1f596d66bf5e302879a063be24524f889b37743836ddd94bb011330c48b15
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains a large number of external links, many of which are hosted on suspicious domains and appear to be part of a link farm designed to improve search engine rankings for unrelated topics. The primary lure appears to be related to 'creative writing clubs', but the embedded links likely lead to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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
  • 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://vilenefex.ru/strik?utm_term=how+to+start+a+creative+writing+club
    • https://cdn.sqhk.co/losomilodip/gcgfjiD/77890853723.pdf
    • https://cdn.sqhk.co/rusobotakox/i23giNi/happy_birthday_cake_images_download.pdf
    • https://cdn.sqhk.co/rapigufagi/p5tjbME/nokononodomuwujisodob.pdf
    • https://static.s123-cdn-static.com/uploads/4450732/normal_6005fad150fbc.pdf
    • https://cdn.sqhk.co/jezaziritav/76XSxjh/vikejodududegulopazuvevi.pdf
    • http://bomufofo.iblogger.org/37614636917.pdf
    • https://cdn-cms.f-static.net/uploads/4388276/normal_6025f322d8301.pdf
    • https://cdn.sqhk.co/rerunagakiz/cQpegey/tefeboxefuvekobufemebeno.pdf
    • https://jonozexogu.weebly.com/uploads/1/3/4/3/134357932/a2a4cca4.pdf
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/silewabikuviwi-kuwije-rugezamu-dajijag.pdf
    • http://jasovawuke.22web.org/dupudelesonuk.pdf
    • https://cdn.sqhk.co/kewawukufiju/03dsnje/ultimate_combat_kung_fu_street_fighting_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tawatibajat.rf.gd/bakteri_enterobacter_aerogenes.pdf
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_50277b7a94bc4c138999c785a3a5ee38.pdf?index=true
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_09429fbad7e7446bb9296dfaf32e01e9.pdf?index=true
    • http://zeduxekuvuwexu.epizy.com/naguvugalejuvose.pdf
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_f119f8f358524c60a3b433140e9f8a4d.pdf?index=true
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_ff8f5547771845fb8ed55c1010442c9d.pdf?index=true
    • 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_off0000e9c3.bin
92490d434201903c36c7543848d07ae3ee4b6dd206c110c8fbe855111b34c4c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 5220 bytes
font_01_sfnt_off0000fbac.bin
f1927539f2e635ffcf0ea2dd2e14b77a4368fd36b6ed50ebb2b7d596b8505866		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 10564 bytes

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