Malicious PDF — malware analysis report

Static analysis result for SHA-256 644810d5bd0c43ca…

MALICIOUS

PDF

59.6 KB Created: 2020-11-21 01:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efc98cd90958a6aadb6819b8594d7f25 SHA-1: 17f541ee8dc38d338b4504e2ace7ded9f4524ba1 SHA-256: 644810d5bd0c43ca8ec4fa278dbebabeef445ab4d19598342fdec94e8c389d59
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing attempt disguised as an installation manual. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious infrastructure, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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
  • 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/123?utm_term=whirlpool+gc1000+installation+manual
    • https://nawawuxilebop.weebly.com/uploads/1/3/4/6/134679594/naloposisol-kifafonozi.pdf
    • https://pewixuzapama.weebly.com/uploads/1/3/4/6/134655392/kekijavuge.pdf
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/niguzuroneb_xawux_jotonag_vanup.pdf
    • https://mesedegusi.weebly.com/uploads/1/3/4/6/134600151/359ae.pdf
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/zadif.pdf
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f874e8f35be1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zevutebulaworel/american_express_brand_guidelines_2018.pdf
    • https://s3.amazonaws.com/jipowumat/16820460294.pdf
    • https://s3.amazonaws.com/nitatotol/frigidaire_gallery_refrigerator_user_manual.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/11430912851.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_off0000ac79.bin
a0f3da32506ae94eb2dc2469f665b8eb015ffe6cfcc434ff595600f35a19f15b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC79 5552 bytes
font_01_sfnt_off0000bf4d.bin
27d633c3a677070295ff537d1840588e1d415ec1a432b9433d941af31b5f975d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4D 10332 bytes

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