Malicious PDF — malware analysis report

Static analysis result for SHA-256 9248cba2f6634462…

MALICIOUS

PDF

73.3 KB Created: 2021-01-09 15:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: db0c551f610f7f108ed60df78eb6419a SHA-1: 912dafbe611269352002ee11bc464fb8d6be6e38 SHA-256: 9248cba2f6634462e509d5439c061e8e113d590c9f1a9084a017004fccbf045e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm with numerous external URLs, many pointing to disposable hosting, suggesting an attempt to obscure the true destination of a payload or phishing content. The presence of a URL with a 'utm_term' parameter further supports a phishing or scam-related lure, potentially disguised as a driver download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=mensajes+del+agua+pdf PDF link annotation
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/mavebolanawususovuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459621/normal_5ff8998b11a75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461761/normal_5fd1bae03ff30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5fa24f6113fbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5f9f2d52726b4.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/4054307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481819/normal_5fded7f57e74a.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/tisazilezok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388282/normal_5f8ed88b4dfea.pdfIn PDF document text
    • https://detagugijubofex.weebly.com/uploads/1/3/4/3/134365812/8391459.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/e0a6a237-c75b-443c-9e49-70a9d5fc4535/driver_brother_dcp-_t300_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/womakogizidotasisovavisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d1fae2-52ea-4305-8dcf-1bb6b761eebd/68833026972.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_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 5196 bytes
SHA-256: ae82c74306036cfc7758b7ebd8f14f9fe2c81acffebbc09e492b5709bc3a37c7
font_01_sfnt_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 11560 bytes
SHA-256: 96f8bb811a235016d7e72da5e06a609ed869fdac36dab43b4ad6d6e3d991d933

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