Malicious PDF — malware analysis report

Static analysis result for SHA-256 24372c7cc1367403…

MALICIOUS

PDF

73.0 KB Created: 2021-02-16 22:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 41d023b5b8ff16703ba24ffb56e91c02 SHA-1: 05a4f769c303031a9c571c024781f9a8d6563ff7 SHA-256: 24372c7cc1367403991e73742050077ed07502e924eac41023d48138e40a664f
146 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The document body, though heavily obfuscated, contains references to 'Insinkerator disposal switch recall' and is associated with numerous URLs, many hosted on disposable domains, suggesting an attempt to direct users to malicious content or services. The presence of embedded URLs and the overall structure point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/123?utm_term=insinkerator+disposal+switch+recall PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5ffde08883e5e.pdfIn PDF document text
    • http://sabukapu.22web.org/act_practice_test_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_6016808c73507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417208/normal_5fcc5f1537769.pdfIn PDF document text
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/foleju_sejutina_wotozeku.pdfIn PDF document text
    • http://zaduzoronogikex.22web.org/tojakoxako.pdfIn PDF document text
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/7663224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_5fdc20f0b4771.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373749/normal_5fe38f18a9ee5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413119/normal_5fc8af4811729.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/7ef998551eb800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodobokojezaga.epizy.com/dota_underlords_item_cheat_sheet.pdfIn PDF document text
    • http://xafamikipu.epizy.com/sosapufizig.pdfIn PDF document text
    • http://nedenapurolaket.rf.gd/risidizapobe.pdfIn PDF document text
    • http://xuxejoser.rf.gd/2008_cadillac_sts_v_performance_parts.pdfIn PDF document text
    • http://dovijurosovixen.rf.gd/service_desk_operations_manual_template.pdfIn PDF document text
    • http://rifoxofome.rf.gd/75283119846.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 5256 bytes
SHA-256: 0a230477f45172ce8840f16491186ce555c1a895b7a400ce8affc78b4f7eadc3
font_01_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 11456 bytes
SHA-256: 2e2f6a32b509622f6c2e865030f55650441fc39ac44fe196eff7ee265c312269

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