Malicious PDF — malware analysis report

Static analysis result for SHA-256 81da85c7ce22f18e…

MALICIOUS

PDF

79.3 KB Created: 2020-12-03 23:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 84a7213d823ace4714e0a592df3fc31c SHA-1: 16b4b3b26f612c5d370047ef16ae457f5b433a00 SHA-256: 81da85c7ce22f18e4daef1aed02d4f9622adad39b23c0189a300f65f8dd1d528
234 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts the user to call a phone number, a common tactic in tech-support scams or phishing operations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or scamming activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=snap+n+go+stroller+instructions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_5fa232a4d740b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_5fa80d1a0a9cd.pdfIn PDF document text
    • https://jivoxixipilekok.weebly.com/uploads/1/3/4/8/134885045/nivowor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f8ff2f189746.pdfIn PDF document text
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/4303759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f8dfbc9b2b12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/v8_muscle_cars_3_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d97ae0-a185-4638-a55b-4525c3afdf62/61409023763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c5b3b8-7daf-49c0-8619-ab426341f8bd/22716890546.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1bc24e98326c02d87a2e/1606294467857/gary_soto_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc03a987-e48c-4bba-ae1f-e521be40815e/wivufunegaxurob.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_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 5204 bytes
SHA-256: adc1a291ca18da068f9997e9dbe5548ff9fd4f09d3914bc216948d8b12dd2c62
font_01_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 12516 bytes
SHA-256: 136350668d853beeac7e7f0611afd8c48ea15d7abfd8cfe766bce4e50a2d4e00

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