Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a42e195c4b82ae…

MALICIOUS

PDF

70.6 KB Created: 2020-12-15 17:10:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 638bec70397c6f481650f6eeab165326 SHA-1: 15d5fddc701ecd5340612891116ac66ff250df4e SHA-256: 83a42e195c4b82ae22777fcb0aa1753482f4c090600cc9fa565d0533486f6bf6
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/123?utm_term=broadcom+ush+driver+e6410+windows+xp', suggesting a phishing or malware distribution lure. Additionally, it features a PDF link farm heuristic, indicating a large number of outbound links, many of which are likely malicious or part of a spam campaign. The ML classifier also strongly flagged this PDF as malicious.

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=broadcom+ush+driver+e6410+windows+xp In PDF document text
    • https://static.s123-cdn-static.com/uploads/4471464/normal_5fcea63a667d4.pdfIn PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/jopen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467975/normal_5fc47b651859d.pdfIn PDF document text
    • https://vunatoja.weebly.com/uploads/1/3/0/7/130738644/827362.pdfIn PDF document text
    • https://gunobodupisar.weebly.com/uploads/1/3/4/6/134677737/660869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_5fad8d8b5cf6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_5fa257c0d3a35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481065/normal_5fc843e2caded.pdfIn PDF document text
    • https://lutenowunag.weebly.com/uploads/1/3/4/6/134627800/7bfa9.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/zakunafu/501723969.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/esc_guidelines_pulmonary_hypertension_2009.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/19789026176.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/elrianode_defense_request.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/aisle_master_44se_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/visipugafazusumup.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_off0000cb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB28 5984 bytes
SHA-256: d16e0b9d2eeced589f07bb889a47bd94e7b7998ab39043ac3c060ccb7ebdc474
font_01_sfnt_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 14340 bytes
SHA-256: bd060c9712ffaa1da3043ca17ab24a9ed0ef81920833b431895d536acc9ee72d

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