Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3a8efe37183534…

MALICIOUS

PDF

65.1 KB Created: 2020-12-17 11:25:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56341c8c415b02934aeef1db666cbd77 SHA-1: 128215ce35b50838a74c6656e42b05d264fe4739 SHA-256: 1b3a8efe3718353421d0cb7036907335ea06ca69906355c27adfee21ef85ecc8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/strik?utm_term=7.1.4.9+lab+answers
    • https://cdn-cms.f-static.net/uploads/4392861/normal_5f986f08de9a0.pdf
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/368044.pdf
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/712397.pdf
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/moper_resom_kenerumow_razekusetowisi.pdf
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/keporobore.pdf
    • https://kukajuma.weebly.com/uploads/1/3/4/3/134380089/4272662.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jeromopelurab/21308532132.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdee593f75b1664399f180/1606282892363/83293418756.pdf
    • https://static1.squarespace.com/static/5fc5195eabaecd33183d5d49/t/5fd65317ab1a676c728bf843/1607881495464/us_green_card_lottery_form.pdf
    • https://static1.squarespace.com/static/5fc1641b6b97992eb55f7d52/t/5fcaa1f474cefc4aeec79f05/1607115252422/tapenade_stuffed_chicken_breast.pdf
    • https://static1.squarespace.com/static/5fc6769f1452f90b7f0b45ff/t/5fc841acd32d012678f37eac/1606959533387/netisijuv.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe17329d7936484056a548/1606293299005/82271057052.pdf
    • https://s3.amazonaws.com/dumupa/canoscan_5600f_user_manual.pdf
    • https://static1.squarespace.com/static/5fc3a28aaffbf90a66fb884b/t/5fc579b12dd96f5918a7d952/1606777265468/stats_table_dnd.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_off0000c273.bin
4972967a347c1768e992974b920b11b52f57416a96de266968c767239bbe8e08
pdf-font-stream PDF embedded font (sfnt) at offset 0xC273 5224 bytes
font_01_sfnt_off0000d46b.bin
cf6c8a450019829b2f506b84498685166e9b72866b83f2f92b2972312b514199
pdf-font-stream PDF embedded font (sfnt) at offset 0xD46B 10820 bytes