Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb2a3a3812a2a6c…

MALICIOUS

PDF

73.8 KB Created: 2020-12-10 18:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 04b2a751eb53d9d94f8fec729e02541e SHA-1: d3fa7c21be7399aa3f65b51eaae9f2fd394958ba SHA-256: cfb2a3a3812a2a6c6087f565da431ef1637cea0b20f0f6ce0bc4b0a12b3073b4
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=triage+definition+business In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450732/normal_5fd18eccc6b78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483624/normal_5fad715e6537f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f8e946601b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5f8c13e57356d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f9639ec87245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479213/normal_5fc558d9323ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_5fb80dc500fb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_5f9e222d8035b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402948/normal_5fb4c69f48ec2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_5f9153b596d57.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/jukoxisojow/bookkeeping_and_accounting_books_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc71b96bcf5f06bcb7712bb/t/5fcb1257b495bd20281b41ea/1607144025190/light_up_snowman.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/10024149857.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe34d23c6ccf69f3298dbe/1606300884372/dilexixekabilajutekoruje.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc394550a2757459bf3c614/t/5fc40ad34f983757205dc735/1606683347345/rebuilt_outboard_motors.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_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 5016 bytes
SHA-256: 30bc2c4c617236f53d8a64a9ff0d6cf69bbef8464c65b51823c5812a09a7bb4d
font_01_sfnt_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 10748 bytes
SHA-256: 5d34c941ec61df2560969b835e19a1e86354c5a5d6ac997faa20175f7eb42dff
font_02_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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