Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d2bb04f061d39e…

MALICIOUS

PDF

61.2 KB Created: 2020-11-13 11:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9ee4505dac414ae64c74b84e65544aa5 SHA-1: 6014d4161f34a88a0d77a90aaf9d18eb4236f8d2 SHA-256: 88d2bb04f061d39e1283addae5216f673f608e9e1a420d78541a2e1aa633546d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?utm_term=calendario+2020+puerto+rico+para+imprimir PDF link annotation
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/d46f7.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/4117077.pdfIn PDF document text
    • https://gupupekulumo.weebly.com/uploads/1/3/4/1/134108922/7840c35913e6e3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f8f2746c7af4.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/jixesuwobu.pdfIn PDF document text
    • https://debemalimuwu.weebly.com/uploads/1/3/4/3/134385929/ruwukinekek-foziguwuzase-nuvid-penap.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/2075924.pdfIn PDF document text
    • https://lopuzidijunusi.weebly.com/uploads/1/3/4/3/134378181/5030813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5f898aa430897.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/552532da-42c4-4047-9b8c-2ea6d7e06154/72625845625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ece31b-dde1-4568-a700-337205b7773e/13802111362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d7670f-021b-4117-8fd0-9d07e2f2173a/37034609243.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_off0000b0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A0 5220 bytes
SHA-256: 7a4d8a7ac91a50007dd9cb93085401ace6d6b351f2c9b3a90811207677c73cf9
font_01_sfnt_off0000c241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC241 11024 bytes
SHA-256: b4133c250edb6bd1a5693ae9f6a16ecb55cb2959b2b5141aa9b9fc8b6bbb01c0

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