Malicious PDF — malware analysis report

Static analysis result for SHA-256 134312c17e7daa89…

MALICIOUS

PDF

76.4 KB Created: 2020-12-26 07:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94f34d2243849d5d20dc33ae41df1de0 SHA-1: 15670f9c718bcaba59eed71303d38185a9e18d40 SHA-256: 134312c17e7daa89548e1ffec0342f734fbe29ec67086072810fc0b5b008ee20
174 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a machine learning model indicating high maliciousness. The 'SE_CALLBACK_LURE' heuristic specifically identifies the document's content as a phone lure for callback phishing or tech-support scams. Although no scripts were extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=garmin+rino+650+accessories
    • https://static.s123-cdn-static.com/uploads/4461204/normal_5fe17b2aca336.pdf
    • https://cdn-cms.f-static.net/uploads/4480403/normal_5fb943eaf381a.pdf
    • https://static.s123-cdn-static.com/uploads/4374024/normal_5fcb5f91d3b5b.pdf
    • https://cdn.sqhk.co/poturofivat/GplBif2/20450318244.pdf
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5fca56d9d3a04.pdf
    • https://cdn-cms.f-static.net/uploads/4419441/normal_5faaed2f67fe0.pdf
    • https://cdn-cms.f-static.net/uploads/4427282/normal_5fa6574534829.pdf
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5f9fb30b0ff0d.pdf
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5f9bace5929ed.pdf
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5fa07f0ad43bc.pdf
    • https://cdn-cms.f-static.net/uploads/4489848/normal_5fb679bcb331a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/952441b0-804b-4c3a-8c34-c40f440f78e0/calendario_2019_escolar_2020_sep_cdmx.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_off0000edbe.bin
1fd5f4d312f88792197b3f0d0509a79733fd9ff284cf587a1f36fc32ec2caef7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 5364 bytes
font_01_sfnt_off0000ffe3.bin
ef5ae33a856097a19d266c7e6617c974712f6b39e6878b32eefedd4fef651859
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 10760 bytes