Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d67bc4cf7f4c572…

MALICIOUS

PDF

77.0 KB Created: 2021-04-02 22:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba229efd03bda9a7ab4c83cb0d5fd344 SHA-1: 77853489dec99f00a8e1b48e205863f95d89ae64 SHA-256: 3d67bc4cf7f4c5726d2bf50881deef71f285e89fc51da3a32df0f7d4182c936e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of embedded external links, suggesting it is part of a link farm or phishing campaign designed to redirect users to malicious sites. The primary URL, https://ponafet.ru/strik, appears to be a lure for product searches, likely to disguise malicious activity. No scripts were extracted, but the extensive link farm points to a social engineering attack.

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-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://ponafet.ru/strik?utm_term=lasko+t42950+wind+curve+tower+fan+with+remote+control
    • https://cdn.sqhk.co/wifavizen/fEnXihD/6500958263.pdf
    • http://lulopoboxefon.scienceontheweb.net/apprenticed_to_a_himalayan_master_a_yogi_s_autobiography.pdf
    • https://cdn.sqhk.co/laxegipo/i0Thdhi/1st_grade_activities_online.pdf
    • http://pivolirarorip.mypressonline.com/english_articles_test.pdf
    • http://pararapameso.getenjoyment.net/4806244856.pdf
    • http://bonozowibewoz.mypressonline.com/dutifazabaxedawunasipi.pdf
    • https://cdn.sqhk.co/mexovaru/BsjgwdN/3d_dj_mixer_music_mod_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xijuxosisomuna/brownies_uniform_singapore.pdf
    • https://6acbaf94-bc62-4fdb-9a00-914544f0b606.filesusr.com/ugd/3ee118_cec720137f2e4ecfacb136875b7a3242.pdf?index=true
    • https://s3.amazonaws.com/sazomo/broken_angel_music.pdf
    • https://s3.amazonaws.com/nemafu/40507259479.pdf
    • https://s3.amazonaws.com/potamotaz/80672344730.pdf
    • https://s3.amazonaws.com/jobavo/10200178431.pdf
    • https://s3.amazonaws.com/jopomodilamego/lisovexomadupimifoxeg.pdf
    • http://wutorokanotomav.onlinewebshop.net/jomubulubajuwosijep.pdf
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_0b43771768204761bcdd32ef20c5982a.pdf?index=true
    • https://s3.amazonaws.com/fajeloninesitel/zojawep.pdf
    • https://s3.amazonaws.com/viregujipowuru/mejitezil.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_off0000e7b8.bin
447c4400db50cdcdc5df17eb817bc31a30e5292332b70265258c85b5be335993		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 6060 bytes
font_01_sfnt_off0000fc5c.bin
e126e7647fc072e4a79adb8a6f5664d35c7183314aff4989b8704fa4e41addc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 12128 bytes

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