Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e195db9ace53455…

MALICIOUS

PDF

74.1 KB Created: 2020-11-20 00:35:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a88cee0c3ec3161abdb1a7e4b9cff9ce SHA-1: 64185352e09bcb66ddd350dbb92285ca85d9e648 SHA-256: 8e195db9ace53455ed32d910781484d197586e064c9dde1ac454c499dec9c17d
214 Risk Score

Malware Insights

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

This PDF file contains a link to a known malicious redirector, indicating an attempt to lure users to malicious websites. The presence of numerous external PDF links, some pointing to potentially benign content and others to unknown or malicious sites, suggests a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing or trojan variant.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=largest+city+in+bavaria+germany
    • https://cdn-cms.f-static.net/uploads/4372105/normal_5fa2e8aa8be25.pdf
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5fa46ce465424.pdf
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5f91335cbb47d.pdf
    • https://cdn-cms.f-static.net/uploads/4392453/normal_5fa528822e4b1.pdf
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f895239d90bb.pdf
    • https://nugekepujipa.weebly.com/uploads/1/3/4/3/134318644/vapederesivesuwer.pdf
    • https://cdn-cms.f-static.net/uploads/4394077/normal_5f9293d325f15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jidosatikim/11088208129.pdf
    • https://uploads.strikinglycdn.com/files/9d6b8547-f5fc-4759-98ce-4248b4363a47/kotivudadalowulufukof.pdf
    • https://s3.amazonaws.com/wixanarer/reading_comprehension.pdf
    • https://s3.amazonaws.com/sigobija/bland_high_school_bland_virginia.pdf
    • https://uploads.strikinglycdn.com/files/b90ffb2e-baaf-4a7c-942d-ae2ce7450396/bifold_doors_revit.pdf
    • https://uploads.strikinglycdn.com/files/a0063f92-15d5-4746-b3ec-fbda6e4f1981/dininib.pdf
    • https://uploads.strikinglycdn.com/files/b35fb044-296b-42db-89f2-ba8aa68912ad/61495425035.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_off0000d825.bin
e0533d6718cd966ac7dac767afe270b55e669edb56010f35c7d7bcfdcd763a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 5328 bytes
font_01_sfnt_off0000ea49.bin
e0a0edee94ce29c9c71aa53cf97fd3368b2427b821036d1e314ce36e266df345		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 16124 bytes

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