Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f1a88b58d00b5c…

MALICIOUS

PDF

74.4 KB Created: 2020-12-19 12:37:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da7732825b566018258e65e215642f94 SHA-1: 58372142a2aaf89ba43f1f18393bf6a2a212f9f4 SHA-256: c7f1a88b58d00b5c99f842c3f0d5c89deedbda8765bc4912ecb05a4c21e4466e
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/strik?utm_term=burris+laboratory+school
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/5972499.pdf
    • https://cdn-cms.f-static.net/uploads/4422145/normal_5fa9e4853abf6.pdf
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/vedatizosede-kuvekitetuvu.pdf
    • https://cdn-cms.f-static.net/uploads/4416144/normal_5fb5bc2688428.pdf
    • https://static.s123-cdn-static.com/uploads/4479210/normal_5fc4cb16186eb.pdf
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/xurejetexu.pdf
    • https://roxexiku.weebly.com/uploads/1/3/4/4/134445291/1015060.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d204d1a2-968c-4004-ac4c-7ba5a9d9a8b3/sasejuliwako.pdf
    • https://s3.amazonaws.com/mijedusovineti/65948666731.pdf
    • https://uploads.strikinglycdn.com/files/f060fd1b-37be-491f-a166-8a4ce0e52f4f/bulk_image_downloader_serial_number.pdf
    • https://s3.amazonaws.com/zagubip/lufulanafubuwugama.pdf
    • https://uploads.strikinglycdn.com/files/c66be6b3-85de-4bc6-8332-6384be0cc132/33379239711.pdf
    • https://uploads.strikinglycdn.com/files/daee72a1-1710-4064-a3b3-0391470b17ae/samurai_love_ballad_party_saizo.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_off0000e4a8.bin
ab0f1d54719969087b6dcea0f7b5418593bfb51ddc411f9852ad0c7828551fae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 5180 bytes
font_01_sfnt_off0000f641.bin
ae64c08b319df9bab95bf8226399bd04dbb4b000b0343883384c416ca3524375		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 11396 bytes

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