Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0925a8a817cfae…

MALICIOUS

PDF

70.0 KB Created: 2020-12-28 10:09:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 71b9480f6213409a08b4f89c6561ab29 SHA-1: 1459d314ed90eeb34ec43e2a4081d1b071c4c173 SHA-256: db0925a8a817cfaee699a954e0bbe813ced7d8d3341a991df1375bb4dc570cfd
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDF files, which is indicative of a link farm or a method to distribute further malicious content. One of the embedded URLs, 'https://traffmen.ru/strik?utm_term=krita+brush+not+showing', is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/strik?utm_term=krita+brush+not+showing In PDF document text
    • https://cdn.sqhk.co/solumapidema/idgCgdB/download_f1_mobile_racing_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/midipumep/jiiihis/82337757691.pdfIn PDF document text
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/jawaru.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/dolilidopabar-barisozujapo-siwodij.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/tuxexi/fegona.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/selubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1c8cf7-ba7a-4b82-80e2-629b5365d031/19070763900.pdfIn PDF document text
    • https://s3.amazonaws.com/wozibap/jokebodazikak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d90b79-d1ea-4d35-a14c-125604463b3d/1042723456.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/lexizasu.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/10882622539.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/raymond_williams_structures_of_feeling.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_off0000d4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D2 5116 bytes
SHA-256: 6324719f764591f2d6fc647246075fe60d030ac2ba08322cb13ca33e0c14ee99
font_01_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 11404 bytes
SHA-256: 4e346408c0a830c2a50c94a7f80137dd96bfd2d0314ddd115fc4cacfc1589aff

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