Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e51a471262874dd…

MALICIOUS

PDF

64.5 KB Created: 2020-11-25 05:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e070a56b779798a0cba6a57f958b5de SHA-1: 1e49a0c524dbc9a469d16512592e4ef022d32262 SHA-256: 1e51a471262874ddfb3f671a5bec9acd0960cb8566bf6c52f64f819364422ced
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to prompt the user to call a phone number, a common tactic for technical support scams or fraudulent billing schemes. The presence of multiple external URLs, including one pointing to 'trafffi.ru', further supports the malicious intent, likely for redirecting users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=norton+middle+school+columbus+ohio
    • https://cdn-cms.f-static.net/uploads/4374980/normal_5fb7493ea8565.pdf
    • https://cdn-cms.f-static.net/uploads/4426416/normal_5fad116e267d4.pdf
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/jesozitufas_bareradikakap_zopan.pdf
    • https://jidugurulepapol.weebly.com/uploads/1/3/4/3/134310086/pewuzetamolixuj.pdf
    • https://gilawigegazimo.weebly.com/uploads/1/3/4/5/134520665/wotunoj.pdf
    • https://xoretewajojuso.weebly.com/uploads/1/3/4/4/134474148/4335025.pdf
    • https://bafuvaki.weebly.com/uploads/1/3/4/3/134336870/f0ccecf1e9.pdf
    • https://xemifedawunata.weebly.com/uploads/1/3/0/7/130775780/wunigurujuwurowawix.pdf
    • https://jiwedizuku.weebly.com/uploads/1/3/4/3/134310564/legavexasibexo.pdf
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/jigejewebixomejav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zunaporam/sierra_middle_school_website_parker_co.pdf
    • https://s3.amazonaws.com/pirosisob/47818040264.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_off0000bf03.bin
2739cdd1d5d8260f807cb36346d144aae81c9a0042553d1f408445879a9a1a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF03 5080 bytes
font_01_sfnt_off0000d023.bin
321317fb7446fd9ee39ed75955c022eb8304f6c1ecfc541e3b232b962422f96b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 10864 bytes

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