Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ba6f52d41271b1…

MALICIOUS

PDF

72.7 KB Created: 2020-11-26 02:22:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 773a66b024af4b97cb32b1d9995be4f8 SHA-1: 1bb818f1d1fdbd3fae88cba976d95e747a2d987c SHA-256: a5ba6f52d41271b1f650b2eecc828ccd35ab0553dde2904491afd4db253e0c79
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/strik?utm_term=body+reset+diet+pdf+download+free
    • https://cdn-cms.f-static.net/uploads/4454436/normal_5fa65aba2d2eb.pdf
    • https://cdn-cms.f-static.net/uploads/4495269/normal_5fb5ff374a3f0.pdf
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/3b2a98b30e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a7230ba6-1e16-4b81-a250-1bad620a2e84/leo_horoscope_ganesha_says.pdf
    • https://s3.amazonaws.com/pokixovuxik/gaomon_s620_pen_nibs.pdf
    • https://s3.amazonaws.com/vabemavuputenif/wheelock_s_latin_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/97459d24-ab7f-4955-bc33-7242dd12db63/67352551978.pdf
    • https://s3.amazonaws.com/dedinavesute/67446980366.pdf
    • https://s3.amazonaws.com/dumupa/70840943250.pdf
    • https://s3.amazonaws.com/bejeseja/general_electric_logo.pdf
    • https://s3.amazonaws.com/nowonovege/sample_thank_you_letter_for_a_guest_speaker.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d135.bin
3f002c0daa813fad8b175c8e8deab975bf35512975af714ce7df40c703cbb8bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD135 5064 bytes
font_01_sfnt_off0000e293.bin
bf8ff804d6d28c0e5159948297f13520dbbff3d10573aa04a09236b3cd6e4f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 10984 bytes
font_02_sfnt_off000107df.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 4324 bytes

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