Malicious PDF — malware analysis report

Static analysis result for SHA-256 391946fc26972a89…

MALICIOUS

PDF

63.0 KB Created: 2020-11-23 17:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c70fda784904f18a25f665989a71195c SHA-1: 2cffa13d62e11f048b0e34502721020be31bf321 SHA-256: 391946fc26972a8984a30224eddb51b6fe0d8071fd378e8467bca5a5bcedbed0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to a Vizio wall mount, likely to entice users to click on the embedded malicious URLs. The presence of external links indicates an attempt to redirect users to potentially malicious sites for further exploitation.

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
  • 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://trafffe.ru/123?utm_term=vizio+e48-c2+wall+mount PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403805/normal_5f94009a8265c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5f95e9aad1ea2.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/mifetuni-jugapetoka.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/2413756.pdfIn PDF document text
    • https://duwusejirut.weebly.com/uploads/1/3/4/3/134370685/ropanotevewagiloro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5fab63ff84322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f8aae5713b2c.pdfIn PDF document text
    • https://vagobodowi.weebly.com/uploads/1/3/4/6/134600101/9572467.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/7924f7df-c495-4820-bfe1-f452b58c2359/renitebujowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3fa270-f184-4ae6-8658-506b1294f9ed/57662088786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a1351b-091c-4c09-84eb-04805e20dfd4/estudio_biblico_sobre_la_santidad_de_dios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a1458bd-caae-4b97-ad50-864d4bf5f617/cerco_epidemiologico_oms.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_off0000b859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB859 5224 bytes
SHA-256: 67df11bd6283a3fd6f245a381758b1d8c321c2e01d4e574cec8e122bd6d8baa6
font_01_sfnt_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 11004 bytes
SHA-256: e73e290c52e0ccf6e161531d385a85d950159b82a80b38800dffc65b9aba88bb

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