Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c2ba8ee3f66521…

MALICIOUS

PDF

68.8 KB Created: 2020-11-25 14:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b6f45e15ed1ad185f12423d7701e3863 SHA-1: 5ed2254fac0a2ebbef69e630eb2d3b6cf709881d SHA-256: 83c2ba8ee3f66521b1acf73971a211a20091f25b96c3cc6810c194a28321a905
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector pointing to `https://cctraff.ru/`. Another heuristic flags it as a PDF link farm, indicating a tactic to distribute malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely for 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://cctraff.ru/123?utm_term=simulation+lab+ionic+and+covalent+bonding+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_5fb51e92e3601.pdfIn PDF document text
    • https://zaxiradijewebox.weebly.com/uploads/1/3/4/8/134889682/2989501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_5fa65e4d2829e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486368/normal_5fa9bf6a58d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416321/normal_5f95120de5e7e.pdfIn PDF document text
    • https://mepotogi.weebly.com/uploads/1/3/4/7/134737672/xizexamekazofigaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5fbb9438cf6ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_5f8d66cc76624.pdfIn PDF document text
    • https://noxetetejiv.weebly.com/uploads/1/3/4/3/134391164/wozejikemujo_jubajijiz_wurevinoboj_wowigixaduket.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc242438-3a83-4868-92ca-fec7a451f596/68724270331.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/pogovufowokajifidas.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/psn_card_free_no_survey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ecab1f-f8f6-4854-abc4-d9e1b5574463/35860920963.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_off0000ccd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD6 5820 bytes
SHA-256: 461bbfa687992e95cacd11e015bbacb5dbd52fbb5d7bf93ffae5b0a6b19d56e9
font_01_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 10964 bytes
SHA-256: 4c747274d9c771196fbb4e80682f1c96115e175ddec69ba665fd7a8977faa5e3

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