Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5c0163b869940b…

MALICIOUS

PDF

72.9 KB Created: 2020-11-13 08:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 55f24cf9d97d2c251863b9443502d3b2 SHA-1: de5185058c3440dcc950d160aba780def45195c2 SHA-256: 6d5c0163b869940bca7bfe18f72919a9328e0a82462ccede2fd89d95ce2f42d9
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/strik?utm_term=introductory+statistics+gould+soluti PDF link annotation
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/37c2f85c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f8e7677b755c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5f8c0e9fc7563.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/091a201c-2175-4fc3-8f71-322b77cbed2c/449758717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ee8fa9-e0dc-4854-90aa-2cc089774d18/kususabipusolixirigu.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/calisthenics_routine.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/mukutokurafoguvujoxesotir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f66b7be-fcf4-4dd6-a7b2-7e92c8151996/essential_ck2_dlc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af374236-0c98-4872-8390-3a4b30eadd6c/wosulazolitazulipam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1d15171-950a-4f41-b9df-9400ae630279/12204219110.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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 5148 bytes
SHA-256: 0f9aa5d64129f8189fb0f52aa46b83e41f34eefb5c489bf3ea38a1e0307a9f1f
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 11000 bytes
SHA-256: 309ec5b7e653373fc8865bc4a42cd871db3bb49e6e53cf07c8ec23e1a618e4f5