Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43618e76a5de7df…

MALICIOUS

PDF

75.1 KB Created: 2021-02-21 01:04:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 65ace109312ba0ce0d4c40c650f6628f SHA-1: 96b6868d5dd445d5cc5aae7aeb043fc49d182247 SHA-256: c43618e76a5de7dfdc9bc70b1d7876e74d55cbd747f08594a3be2919612b8acf
186 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external URIs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to distribute phishing lures.

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://jacksth.ru/123?utm_term=the+purple+book+hand+therapy PDF link annotation
    • https://wopirizebopate.weebly.com/uploads/1/3/1/4/131452778/cdebb4c.pdfIn PDF document text
    • http://siankaanmexico.com/rogers_cup_draw_sheetu6141.pdfIn PDF document text
    • http://stnold.com/dumuwofow5raiq.pdfIn PDF document text
    • https://kadonomu.weebly.com/uploads/1/3/1/4/131454950/034fc0d768.pdfIn PDF document text
    • http://wodebawoxisire.22web.org/what_is_area_code_809.pdfIn PDF document text
    • https://gibejeki.weebly.com/uploads/1/3/1/4/131438187/figufesorawofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_602a22e11415f.pdfIn PDF document text
    • https://xixefofitajeres.weebly.com/uploads/1/3/3/9/133999179/befewigalomatubi.pdfIn PDF document text
    • https://melekutiruj.weebly.com/uploads/1/3/2/7/132740408/texolil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_602e7f18c3e63.pdfIn PDF document text
    • http://ledivezakaw.iblogger.org/vifozosuza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454426/normal_5fc8874fbc63e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457590/normal_5fdbd150a90eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482618/normal_5fcaf43c42f11.pdfIn PDF document text
    • https://jewakazakiven.weebly.com/uploads/1/3/1/4/131437085/6508656.pdfIn PDF document text
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/timasarulos_wijexeli_mewufemit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jebefufodapiwi.epizy.com/project_dependency_tracking_template.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_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 5124 bytes
SHA-256: 0329cf1a84b736427441b7e0ca871e62b428788f014c2192916902edc656f4ca
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 11600 bytes
SHA-256: 97260850df02b05f7767d69693bd78eec018d41f9aa32f7fe1d8fd943ddd0628

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