Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3af6431ac5dc217…

MALICIOUS

PDF

70.9 KB Created: 2021-04-27 11:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bcc038bdfa1c0bccf3cbff4249167c9a SHA-1: 8c842e011c52944866934fbdf23c543753da86a1 SHA-256: d3af6431ac5dc217509ddf4908a64e456cfce827d8551278f80eb1b8cfc83aac
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs, such as 'https://zajinet.ru/strik?utm_term=online+quran+teacher+jobs+in+rawalpindi', are designed to mimic search results to entice users to click through to potentially malicious sites.

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://zajinet.ru/strik?utm_term=online+quran+teacher+jobs+in+rawalpindi PDF link annotation
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/4338041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_5fd1f1572216b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_601852330df22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_604671cc928da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_6037b7fccccc6.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/website_development_tutorial_point.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/machine_language.pdfIn PDF document text
    • https://bafewalu.weebly.com/uploads/1/3/5/3/135350628/vajifepukojilen.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/nizumejovevujasonaw.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/nuxikegim.pdfIn PDF document text
    • https://nitagupivef.weebly.com/uploads/1/3/4/3/134342099/gipeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_6028747731532.pdfIn PDF document text
    • https://kubetezoruxi.weebly.com/uploads/1/3/4/6/134600107/xizumanififaliser.pdfIn PDF document text
    • http://padojobimo.mywebcommunity.org/cbse_syllabus_for_class_9_social_science_2020_20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_602da329287eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5fd1cea54aa8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388424/normal_5ff85c51b0432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_600e31d7447ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 5624 bytes
SHA-256: aa6526433d76de8f59b1d0dd8fc6821a1fb1f64d64fb4d1212f712c144cdcee7
font_01_sfnt_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 10524 bytes
SHA-256: cf94fed81842c9f72621ce2920fc83632e255a71223d024e5b2bb9a65e537345

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