Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d0cf7f5e35c61f…

MALICIOUS

PDF

72.4 KB Created: 2021-02-17 07:36:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c63684cbebfcc44ed7d372816db8f625 SHA-1: cd9e2ea31539fa06399124a6800ff14aff28c7d7 SHA-256: f4d0cf7f5e35c61f92a55a8149f68ce5eee4da172fd65a1c2014c81a3a40e259
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=wenzel+current+hiker+two-person+tent In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_5fda1e1a16005.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376858/normal_5fe5f0ed573b0.pdfIn PDF document text
    • http://prizinsta24.site/jojupewufefezexusolenegu1st3z.pdfIn PDF document text
    • http://rukozhop-guide.com/45578787719ajtpv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372980/normal_5ff97537a9b3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483604/normal_5fcbe481a3b70.pdfIn PDF document text
    • http://nasporte1.fun/micelle_formation_animationukuos.pdfIn PDF document text
    • http://agencymedia-ig.com/white_magic_grimoireh75tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_600fa2cd793e0.pdfIn PDF document text
    • http://ketotreno.buzz/consumer_reports_refrigeratorsyxxzx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5fd222bf606f7.pdfIn PDF document text
    • http://beremoter.online/74687940137z65wz.pdfIn PDF document text
    • http://magic-world.site/778108357120iye5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_6010fcc08d44f.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/gewisetug/guided_by_voices_european_tour.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/vufozerepajevaxivon.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/wujuregagapusozoluge.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_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 5064 bytes
SHA-256: a0bd1c7e11effc511a723c0e8a3538f6d69ca439b9f2a7c3423fe7dbf49739bd
font_01_sfnt_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 11164 bytes
SHA-256: c3ee1f4bd2419cb8c46d0fa3e6e0c87973664831b59b481c3b876b7e039515f6

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