Malicious PDF — malware analysis report

Static analysis result for SHA-256 422cfa81278e62de…

MALICIOUS

PDF

62.1 KB Created: 2021-01-06 03:34:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3264424b6339aa8558c6d05b469bcb8b SHA-1: 76d305054f9f62b0f9e0fb781b9d177283483417 SHA-256: 422cfa81278e62ded8be08521703d68747d48f9273ee7be1e663a8066d6101be
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 0.9997

Heuristics 6

  • 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.
  • 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://traffnew.ru/123?utm_term=casio+illuminator+alarm+chrono+watch+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472216/normal_5fae97d20245f.pdfIn PDF document text
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/3837724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375341/normal_5fc9bdbf92a54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477916/normal_5fe18faf83868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f9be48be0f4c.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/8390125.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472753/normal_5fcd548396827.pdfIn PDF document text
    • https://buwabasowo.weebly.com/uploads/1/3/4/3/134353515/97ce98b5779ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_5f89866042e67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_5fa223d468997.pdfIn PDF document text
    • https://tifixexeruwa.weebly.com/uploads/1/3/2/6/132682204/nelikorojopa.pdfIn PDF document text
    • https://getomipo.weebly.com/uploads/1/3/4/4/134403721/3050767.pdfIn PDF document text
    • https://vusuvorolom.weebly.com/uploads/1/3/4/5/134501440/071a4c0b40.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/83b975c5-19a1-45b2-a6f4-4b235a874046/69870237848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e881f0e-1fe0-4d06-8732-7a66f0eb3930/dragon_reference_drawing.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA36 5036 bytes
SHA-256: 8a3cb12dee3c1dec03d08127a2c148e1afc0268b42eb4417aca0bdf09503ff3e
font_01_sfnt_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 9584 bytes
SHA-256: 4e04bc5fdd7c664406c39807635ab9c000d7782f0e024a4d7bab823547ea1d91

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