Malicious PDF — malware analysis report

Static analysis result for SHA-256 4497a9ce3be8e417…

MALICIOUS

PDF

72.0 KB Created: 2020-12-26 01:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 79bedff1a84f2ea587959b6044784aea SHA-1: 85e69c0c8e2922b03f6ca0d2de3c7b20721591d3 SHA-256: 4497a9ce3be8e417c8220ece9654fe18bc060627a206edbcd5ebc4b12d5d42f5
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, flagged as a PDF_SEO_LINK_FARM, suggesting a malicious intent to manipulate search results or direct users to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or link-farming attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://trafftec.ru/aws?utm_term=chashme+baddoor+film++in+hd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390055/normal_5f9a466dce50b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_5f8c717af2b24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_5fc1aaa8d97e3.pdfIn PDF document text
    • https://xawuvokepixa.weebly.com/uploads/1/3/4/6/134617960/a7946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_5fd2d812754b6.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/jfiiZ13/graphic_design_portfolio_template_indesign.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/a6a1e382-2d2e-4c78-8b95-1447d52bc7a4/chevrolet_s10_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2259a0e1-14b5-4c75-9745-0bfa7036cfdb/46780275011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac6292f0-03af-4367-b3f2-2166e4944764/sarubaxomudofiwij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73907c30-42d1-48cd-90e5-7c25249645e0/libro_de_tablaturas_para_guitarra.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC449 5192 bytes
SHA-256: e63b58fff3b40e6bb4d45db0b709847516f1c6b633a80d561a62ba9596f0d045
font_01_sfnt_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 12052 bytes
SHA-256: 566abfed7ac804a07528024458bf4aabb5dcbb6ebf752457d6c08eb3903cfc85
font_02_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 16028 bytes
SHA-256: 8345d1cc2b6b461b856d0454e2cf67edf5851291b6d0ebf21a7da0c9813a2b7f

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