Malicious PDF — malware analysis report

Static analysis result for SHA-256 351c49880f0821d8…

MALICIOUS

PDF

73.2 KB Created: 2020-12-23 05:24:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8d045e186777f5582698f4c27ce061bd SHA-1: ee0db28a43901ded49745a023550fcbe09652039 SHA-256: 351c49880f0821d80f555850727d627202d3ce7064124fe65312c41ba10df714
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'traffmen.ru'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a mass of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=poisson+ratio+wood In PDF document text
    • https://static.s123-cdn-static.com/uploads/4392869/normal_5fc7ebc0971f6.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/abecb03196d7d90.pdfIn PDF document text
    • https://jowakalol.weebly.com/uploads/1/3/4/4/134480841/7403265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401723/normal_5fc592dd1e54b.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://s3.amazonaws.com/satudifin/51404951518.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/fuvalumaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3ae934-2af4-4b80-b8e0-9a1ddf9deb7f/rofavipal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339801f5-a024-4994-8d49-b2c4ae6014de/fabofizu.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/flammability_definition_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54aa5d7e-a14f-4d16-aadc-70fb6a4865db/the_quest_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d7ede8-1ffc-4c1b-ad53-a5f70f1281bc/45777765025.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/37009297994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a5afb1-9a93-4b4b-9364-927ef0cd245d/45296829310.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/brother_mfc-j430w_price.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/mponline_nhm_answer_key_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0a94cc-b0cb-4c77-93ed-d09fb3d66fbe/nibukixomidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a14aa011-e05a-4728-9905-74c0ad40f67c/80676916981.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/91109769778.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_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 4552 bytes
SHA-256: b4e1a24f81f2b4039dc0e95790ee9cbb053e4b53e0efff41aa615de0d996ed6f
font_01_sfnt_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 10868 bytes
SHA-256: 32b92e7828ed3f62dffff21f25f072a27a65f52e444cdab49ed5bf1739791e49
font_02_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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