Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fec6163fbeaf310…

MALICIOUS

PDF

84.7 KB Created: 2020-11-20 23:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ce38cc3522ffc5870527ada54b44dfca SHA-1: dfa204596c3564d914d88b5b6081bdd806462194 SHA-256: 5fec6163fbeaf310d7da5a3c69bcb3b383e76cdc16868497d9073b1331c6db8e
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'traffking.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffking.ru/123?utm_term=sullivan+ballou+letter+summary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5fa61face57dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f87021e13423.pdfIn PDF document text
    • https://rodekimixew.weebly.com/uploads/1/3/4/3/134314341/9617556.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/fuderibavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5fa63133b4a48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480402/normal_5fac3272ac9c2.pdfIn PDF document text
    • https://xubikorapaja.weebly.com/uploads/1/3/4/3/134335605/9238072.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/717030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_5fab890537acf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5fb2d796b07b2.pdfIn PDF document text
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/5794674.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/pitibofesuw.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/south_walton_high_school_graduation_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/84960654553.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 5236 bytes
SHA-256: ab76628562b2178eb7777311a3e65624215782c30148dfd1d8f8e490f7be3412
font_01_sfnt_off000120e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 10812 bytes
SHA-256: ac0395eb9cc5226b0f1df959fa1b0d9543292a6155e8d8177a911ec7abb5b6b8

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