Malicious PDF — malware analysis report

Static analysis result for SHA-256 472807a9ef070424…

MALICIOUS

PDF

84.1 KB Created: 2021-03-27 12:34:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bdda007c37fce8fd264436f2c0093f27 SHA-1: 10c4e3d5c9bd7262be4879465c2a973fe39d2b84 SHA-256: 472807a9ef070424309cea6d71bc07f79380707a104a0d39ecedec1c6e684b12
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=either+and+neither+grammar+rules+pdf PDF link annotation
    • https://sowurudiz.weebly.com/uploads/1/3/1/4/131438308/2562635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_60150e5104f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499995/normal_602980078843e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_6042f3c98b8d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381541/normal_60086c584030d.pdfIn PDF document text
    • https://wafilanukeg.weebly.com/uploads/1/3/5/3/135309269/wawefuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_604a815ce608a.pdfIn PDF document text
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/2981c0394650a.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/aba8a74a-b520-403d-b277-8d933cee70fb/4017493194.pdfIn PDF document text
    • http://dixolasafu.epizy.com/nubepi.pdfIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_100b17e42a5d4eab810de18d1fe13de3.pdf?index=trueIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_e3c13fb7419c47efa665ba5f04b689c2.pdf?index=trueIn PDF document text
    • http://zewuref.rf.gd/84286912148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/692f8fca-4df5-4c20-8b99-a112428ed9a0/how_to_connect_vizio_2.0_soundbar_to_vizio_tv.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_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 5412 bytes
SHA-256: f1d505bf53414e6aee695487ed1b9d9d6c2dee9b053bedfe5f4dd83cf0405ad2
font_01_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 10696 bytes
SHA-256: aeb9dc5757102ced3b4b4856227107559d896c4919ed67606749d7384a79cd7f

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