Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab05b86a7419276b…

MALICIOUS

PDF

88.4 KB Created: 2021-04-19 23:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd0f30c880bfc5daed8c033c33f7507d SHA-1: 7d29b8262078775fabf5f322cffb098dcd246a42 SHA-256: ab05b86a7419276b6f682583da915e295473ff7784867ce32ce07e77dcb739c3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier output further support a malicious classification. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=bell+jar+book+review+guardian
    • https://cdn-cms.f-static.net/uploads/4365626/normal_600aef645ca41.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • https://static.s123-cdn-static.com/uploads/4383930/normal_5ffb9e5621fe9.pdf
    • https://cdn-cms.f-static.net/uploads/4459035/normal_60139633f0faa.pdf
    • http://bilkan.fun/how_to_enter_into_the_courts_of_heavenre5po.pdf
    • http://sosed.market/7440412588h3wrs.pdf
    • http://medicinfo.online/xijufumenawixagaxodly6n6.pdf
    • https://padudarudiloga.weebly.com/uploads/1/3/4/7/134714427/ba7e4537ea23a.pdf
    • https://cdn-cms.f-static.net/uploads/4458389/normal_6048711391f99.pdf
    • https://static.s123-cdn-static.com/uploads/4366958/normal_5ff2cf7ec8636.pdf
    • https://mogiwivimar.weebly.com/uploads/1/3/4/7/134731652/juroset.pdf
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/guxirudufemevir.pdf
    • https://mujamixoto.weebly.com/uploads/1/3/0/7/130776872/pavafadegikajaji.pdf
    • http://servicesforsupport.com/how_many_carbohydrates_are_in_a_taco_bell_crunchy_taco_supremem4k83.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_ee8eafcf098e47a4ac784d2ac71a87f1.pdf?index=true
    • https://s3.amazonaws.com/vosimalume/xuseminitemewulasizunona.pdf
    • https://s3.amazonaws.com/rejiner/sawopemopomadinigemabuvo.pdf
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_db7b88c12a584871a77bc1c00856cdf7.pdf?index=true
    • https://s3.amazonaws.com/nisoxow/58206156584.pdf
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_0baf01f2a2b440eaa64b56e0c85f40a0.pdf?index=true
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_30c1a7fbda9d4e6fb129ccb96341c8d8.pdf?index=true
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_6eadcf3f62574150b2fcb90655bd466f.pdf?index=true
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_7776f0153e9840b2906950a8d697a60f.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_off00011c96.bin
308b31b2ec33455e70cbf4de247ba117d19ada3b306ba03dd3786990f267f86d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 5296 bytes
font_01_sfnt_off00012ec7.bin
f52d07b386ab2b0e9d6024aef40966ef1f535b281cbcac1b2a1e2271aae08f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC7 11412 bytes

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