Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a935afd7959a727…

MALICIOUS

PDF

106.7 KB Created: 2021-02-23 02:06:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 055964ebb7d98c8d16da8d58e640ee38 SHA-1: c344f791211934aa3a01dc2be66b3be3e57bf3a5 SHA-256: 4a935afd7959a727321797fc92ef83e4bdd1705d04db18d263848626f0c7ca30
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to be a lure related to 'charter tv guide athens ga', aiming to drive traffic to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/wix?keyword=charter+tv+guide+athens+ga PDF link annotation
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/dakibibobug.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/accfcfde8cf9c2.pdfIn PDF document text
    • https://bedaruwi.weebly.com/uploads/1/3/5/3/135326402/bakovezuvom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_603184e09dea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_6019c34c649e0.pdfIn PDF document text
    • https://wuzikixow.weebly.com/uploads/1/3/0/7/130775075/beseselu.pdfIn PDF document text
    • http://gufutaca1.xyz/68725906324oz6ic.pdfIn PDF document text
    • https://tererenigi.weebly.com/uploads/1/3/1/4/131405956/budasima.pdfIn PDF document text
    • https://mizewipexu.weebly.com/uploads/1/3/4/6/134609608/jafovowapazi-vepelarubabe-sotabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefuxexo.epizy.com/boston_market_menu.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_off00015b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1E 5020 bytes
SHA-256: a86aa8b0cb6232781202d635db8570ab4e75949aecf18da2aef4e12c1e761874
font_01_sfnt_off00016c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C32 16504 bytes
SHA-256: a7b0a45b99670c2c706b2a7fbb225e60e0162d25cc09ad8c9b285eaf4a9772dd

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