Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c92f675b83c21c2…

MALICIOUS

PDF

80.6 KB Created: 2021-01-02 21:13:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9213ff8e5c2a423e96a08a20f57f72cb SHA-1: 8b9d24305e1aead8b0a17cb4c8c1886342b9f8bd SHA-256: 8c92f675b83c21c242efa9e7d3f39de6321b6f0f26977110095792363dfdba01
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, indicating a link farm or SEO manipulation attempt. One of the primary URLs, 'https://trafficel.ru/123?utm_term=esposas+de+marco+antonio+solis', is suspicious and likely leads to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9814

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
  • 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://trafficel.ru/123?utm_term=esposas+de+marco+antonio+solis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388596/normal_5f9610f52d5b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414336/normal_5f9494681eac3.pdfIn PDF document text
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/bfb15284dcab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411931/normal_5fdc521a300dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503525/normal_5fe6ce579bcea.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/6588f184-2352-4d4f-b099-4cc90fcd57fd/petawosomuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225de47d-83bd-4dfe-af54-422a7da83219/folding_high_chair_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/spt_portable_air_conditioner_manual_8070.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_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 5176 bytes
SHA-256: 43e4ce1af4995cff55406f6b965c32cd5687dba31e9f1407a982b7ee471ece51
font_01_sfnt_off00010d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 11912 bytes
SHA-256: 2790d529e5493e4b2a0da7e43b140f1845ca35cea1e7a90834117e8525af580b

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