Malicious PDF — malware analysis report

Static analysis result for SHA-256 c956a9db0f0045d5…

MALICIOUS

PDF

63.7 KB Created: 2020-11-22 22:10:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c311629929264ba63766df71d6c0ba13 SHA-1: b6e040eaea2d041f827157cba4202e8e7799a690 SHA-256: c956a9db0f0045d56cffb330425ad1f9e1263668b0a819e6ccd66b54ef09d5a1
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, pointing to `https://gettraff.ru/123?utm_term=digitech+rp7+valve+manual`. Additionally, it exhibits a PDF link farm heuristic, with numerous external PDF links, including `https://uploads.strikinglycdn.com/files/050593cc-a85c-43fb-a15d-5ae58d506c2a/five_four_jeans_review.pdf`. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or trojanized document.

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://gettraff.ru/123?utm_term=digitech+rp7+valve+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_5f8d7d06d28f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_5fba7230ef352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5f9e29c535886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f888e59633cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5fb6b1cfc1ff1.pdfIn PDF document text
    • https://gazofifato.weebly.com/uploads/1/3/4/4/134496451/sebelimun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/050593cc-a85c-43fb-a15d-5ae58d506c2a/five_four_jeans_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb2e86f-0df2-41f3-8868-76925eb1825f/looking_out_looking_in_15th_edition_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/dill_mill_gayye_ep_352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43d6c1e6-02e2-4ddc-9589-48c364314518/gafofajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/330726c3-412e-4990-8678-444a730d15e1/58231830408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc7e616e-12d5-46aa-9494-c93b8df1cdb2/mawababivag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfcbb61-8e5f-4d36-9493-eb320aba934c/que_son_las_microcomputadoras.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD31 5080 bytes
SHA-256: 29804c31f90166483b7af8b244dd0abfd8ef220d55ae80b8f16f2d9c09fa8a19
font_01_sfnt_off0000be67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE67 11412 bytes
SHA-256: 9778ea0c29520473d8f0ddff4fb35b2a5024942aff1c5de0b80c071d863c2491
font_02_sfnt_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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