Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfc2f1bd011982c…

MALICIOUS

PDF

71.9 KB Created: 2020-12-02 08:22:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1792e27b4e5ab7cd03f9227c805c454c SHA-1: d12321e0800fa81f7b2cb88835fbb635db4fea76 SHA-256: 4dfc2f1bd011982c7b62ed6517b6c7f2bf308d75da2c85e095838f6a8c247a6b
156 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a malicious phishing document with a large number of external links, likely to a link farm. The primary malicious URL identified is traffset.ru, which is used in conjunction with a seemingly benign document title to trick users. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=society+bye+laws+2019+in+marathi+pdf PDF link annotation
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/a17ea530bf9.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/79633a97-fbaa-4372-8f54-2924948a0e23/godukibetegozofogez.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ecedbf71053ccb1052a5/t/5fc1e7df6457125654815559/1606543329381/70856462234.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4e6c8df132613bbd7397d/t/5fc6f865c7c45a5eaf9a13f7/1606875237903/buvunug.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1015360f2895dc1e86a3c/t/5fc1aabd3c02f22b9d4bdff5/1606527679488/the_mixed-up_chameleon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e417912-6da9-4856-a627-72747b34334e/user_manual_for_cen-tech_digital_multimeter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61be224-27f2-47b8-8f80-485e44e834ad/25321373609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c6839d-e358-48e8-959b-9cbaab9036df/64386155951.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f3af1c8c741314320bf8/t/5fc20b133570fb44d149f0d6/1606552340275/42868609165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d24ba1d-e1ee-48b1-b215-d62977a6a16d/dajikawigiserawarupazuseg.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bebbcd1e280355d37542/t/5fc141409d79364840bb85f8/1606500674135/26225186749.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_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 6312 bytes
SHA-256: 8134f30fa66146620bc3b9fa7e8292f1c6ab797bff63d3f175e15b4510ca1069
font_01_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 10108 bytes
SHA-256: 0c79ace191fe620d6df6c2370544a213ab5ee1a1426778edf0c64157e6327fac

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