Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d6450396c7f864…

MALICIOUS

PDF

93.8 KB Created: 2020-12-17 18:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d887e9cdc33d6fca8ec043a8532b467d SHA-1: 9f1fe666bc9c66e556649caacf1e2f15a1ec1821 SHA-256: 85d6450396c7f8641d140622a5acbacb82bd372d80bfaac7ca019f03b924db65
174 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a machine learning classifier. The 'SE_CALLBACK_LURE' heuristic specifically indicates the document contains a phone number for a fake support or billing issue, consistent with callback phishing. While no scripts were explicitly extracted, the PDF structure and malicious URL suggest an attempt to trick the user into initiating contact with an attacker.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://cctraff.ru/123?utm_term=schumacher+xm1-5+manual In PDF document text
    • https://vexepediv.weebly.com/uploads/1/3/4/6/134668456/5772617.pdfIn PDF document text
    • https://bowiromifax.weebly.com/uploads/1/3/4/6/134613330/birukeg-xumagejaw-ninab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469104/normal_5fbc6edb0848d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5f8a0f5b94b82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc7b5ea81fec0096843efbb/t/5fd0ab86a91a8d2433804afa/1607510918540/31102880826.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f5bd11f6a4198485fb86/t/5fc527aa18e72e5fdb7d34c5/1606756268365/dd_new_classes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28998403f5353fda0357a/t/5fce840b61b15c541473af2a/1607369739861/79469562424.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/behaviorist_theory_of_first_language_acquisition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd81dfed-59e4-4623-8f9e-c904e4bb805f/xitavotaturetegit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96dd6d16-94ea-4c4a-9209-16eb3545a9b8/wet_and_wild_hawaii_prices.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/jokuxixutijif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1247a0db-6acf-4396-87d1-5b426e8afafe/tekefoziluninadoborokaga.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_off00012f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8E 5240 bytes
SHA-256: 8982a3cbd7bfa769e14798b22d1b6a54c7db89ed0876fb9e767e401ca9ec99f4
font_01_sfnt_off00014148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14148 11872 bytes
SHA-256: bfe2f9d7592dd717c3bfa4a17a9f6c4e7b565f3ec6469fa7c372e46a4461b884

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