Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c9afab59a6884a…

MALICIOUS

PDF

76.3 KB Created: 2020-12-28 14:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9698ca230b826738d9d45de5fa28f270 SHA-1: 8a7a0bd539fa6ec4ff9bdd5277381f84964bae57 SHA-256: 24c9afab59a6884ac4d0628713c931d9c8806ab7d778f491a0ce26be8c1c611e
116 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains an external URI and a callback phishing lure, suggesting it's designed to trick users into contacting a fraudulent support number. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'knowledge base article template', aligning with a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffnew.ru/aws?utm_term=knowledge+base+article+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5fa4d2689c2ea.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/gh4H5n5/tanks_bar_and_grill_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/hf30jeH/dugexanafaku.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/bahehjj/50575177915.pdfIn PDF document text
    • https://cdn.sqhk.co/kopizikob/jajf4hb/gostream_app_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/nesafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8799a5d7-dd1c-4768-ac0d-393e1662cddd/par_q_form_template_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/57997940439.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/14045664782.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/38768202634.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/lineaire_hypotheek_berekenen_excel_formule.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/divozug.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 5380 bytes
SHA-256: 43185b84e10ed23b9a53403c02c1ea9f9109eb68fa3206b9b4115b0977455473
font_01_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 10788 bytes
SHA-256: 7050e3cf7d50e914349aa899c7f91624c1aae43cd32e6acd8d3eaf04a158bafd
font_02_sfnt_off0001164b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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