Malicious PDF — malware analysis report

Static analysis result for SHA-256 018a8644e3996a11…

MALICIOUS

PDF

75.7 KB Created: 2021-03-27 20:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08a87a25bf58081e57be3b77f1814a09 SHA-1: e1bb7b68a6faba83c61cb608a5b342d42abc388d SHA-256: 018a8644e3996a11220b02cd0c30cf273459180451a364b7378cf7313f2aa6a4
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and the document body mentions 'Credit rating agency reform act', suggesting a lure for phishing or malware distribution. The presence of a ML classifier flagging it as malicious and ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gimoguvi.ru/123?utm_term=credit+rating+agency+reform+act
    • https://cdn.sqhk.co/geruxibab/bhjjfl9/anti_stress_ball_diy_slime.pdf
    • https://cdn.sqhk.co/pifizumux/QPjbMih/nuxori.pdf
    • http://gonifarej.mywebcommunity.org/how_long_did_the_depression_last_in_australia.pdf
    • https://cdn.sqhk.co/losiluja/SC1PheA/9380402145.pdf
    • https://tijoteveduno.weebly.com/uploads/1/3/4/8/134853829/xivadogeriziv.pdf
    • http://sabumow.mygamesonline.org/1996_jeep_cherokee_2wd_lift_kit.pdf
    • https://cdn.sqhk.co/velabolo/fcjfEPG/unnie_doll_games.pdf
    • http://com-signto5.xyz/foloxikulosojetugezuwufi6x8mt.pdf
    • http://folugomobok.getenjoyment.net/baixar_ios.pdf
    • https://vemubofopelo.weebly.com/uploads/1/3/0/7/130776521/3033037.pdf
    • http://siankaanmexico.com/58066928179fc878.pdf
    • https://cdn.sqhk.co/kafekogi/jMgc0vT/hearthstone_frozen_throne_deck_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_167f7960608b492491a6c44fa1a240b9.pdf?index=true
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_8b2129d6eacf4e188ebe26dae53439bc.pdf?index=true
    • https://s3.amazonaws.com/lunojol/17733069797.pdf
    • https://s3.amazonaws.com/tinezedu/tajipuduri.pdf
    • https://s3.amazonaws.com/gagagakigibapo/rizirevelesikakadumu.pdf
    • https://203e60c5-e32a-4587-ab6d-31d66de6d5b9.filesusr.com/ugd/014c36_16563c62d4e040f3a452143e4ceafcf3.pdf?index=true
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_66b1beb16903427d9fe20265fc429eba.pdf?index=true
    • https://s3.amazonaws.com/palevijuj/app_backup_pro_apk_free.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_off0000e9b8.bin
dc8800056ec7480774ffd8d90e3a69ac2c869fb2bc297203e9e1a0d65d23ea13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 5136 bytes
font_01_sfnt_off0000fb27.bin
152304d55c677063f59736b700b8ceea0f9fe6ba7fe6f4e2c47e56504a44d8b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 11244 bytes

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