Malicious PDF — malware analysis report

Static analysis result for SHA-256 688c7b4843a7ee0d…

MALICIOUS

PDF

70.1 KB Created: 2020-12-25 14:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9c98a750b89ad7ac8aee06cffd3530ab SHA-1: 7a6ac0a0370b0c3987e956bea8dfa371fc242ba9 SHA-256: 688c7b4843a7ee0d19401bd68cb7e1c9ecfa13167232d3ba62268f16816d9610
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, with one prominent URL pointing to 'traffnew.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful sites. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious intent.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?utm_term=thule+evolution+1600+dimensions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449987/normal_5fbc86f8bcc57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402720/normal_5fc88dbe9ee15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_5fd8618c0cfa8.pdfIn PDF document text
    • https://vomagorawu.weebly.com/uploads/1/3/4/7/134720662/4404082.pdfIn PDF document text
    • https://dobekaveliwe.weebly.com/uploads/1/3/4/5/134599348/wepobajaxopu.pdfIn PDF document text
    • https://mivopolidenez.weebly.com/uploads/1/3/4/3/134349928/3076177.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/212b86de-3271-48d1-811e-d6bf9fc7da5b/xenidorekesukomi.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/25772139399.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/wakalolunizivilegonafim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99226813-aed0-474f-a5e5-bafa4cca702d/6772426412.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/hp_elitebook_840_g3_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/buwibaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb6a3bf-38e8-4b97-a90e-8b05e6d1cfb5/niwisifamej.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/tubez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4197a541-8000-4424-84c7-eccd8cef4e7d/88171567636.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_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 5116 bytes
SHA-256: 6486a5916bd9d8e2d14a3caa0011e7bd63d0b77b1b57697a15ae58538232689d
font_01_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 10016 bytes
SHA-256: a2d9b2555c7525eb641524374798f9872f5463724148ce8facd9d49e03edc497

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