Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fd0fb804051085…

MALICIOUS

PDF

67.6 KB Created: 2020-11-25 06:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1a8e0b7ec35a54debda8a0094c3eaff5 SHA-1: 9e1febbd8f82df820418bb124339bb5fd99403d6 SHA-256: 21fd0fb8040510851daa298eed0eb72d27afa1be33009a433c2c65fe59e29a24
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, with many pointing to other PDF documents. This behavior is often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/aws?utm_term=entomopathogenic+nematodes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5f980182a07cf.pdfIn PDF document text
    • https://jiwalevimube.weebly.com/uploads/1/3/4/8/134870165/warutalozexax.pdfIn PDF document text
    • https://sifuzulujiw.weebly.com/uploads/1/3/4/7/134716539/vapetifabamoram.pdfIn PDF document text
    • https://pojosividadom.weebly.com/uploads/1/3/4/5/134524524/f52caa575a35224.pdfIn PDF document text
    • https://dubasatipin.weebly.com/uploads/1/3/4/4/134459773/jagorizu-foxevofoso-miwekikajoze-zerij.pdfIn PDF document text
    • https://kizulivuvuruzor.weebly.com/uploads/1/3/4/8/134850547/nujutofonewapawox.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/9737917.pdfIn PDF document text
    • https://xelenupexom.weebly.com/uploads/1/3/4/4/134480667/f4a85f836d7.pdfIn PDF document text
    • https://kirugivedipabaw.weebly.com/uploads/1/3/4/4/134464293/a0b691bea7fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f88a73701d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f96392a65841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/nascar_heat_4_cheats_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/56939886519.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_off0000cc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7A 5396 bytes
SHA-256: f5193c4222c9196a71a79bf7339f37ffd6ab012fd9e3d873a9dcd8965b9c5e80
font_01_sfnt_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 10276 bytes
SHA-256: b3ce235306b49c51beb78b24ac5689e85fef87c67cb6c5034e2b8aefcca8398a

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