Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c4066ba6d76901…

MALICIOUS

PDF

85.0 KB Created: 2021-04-26 10:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 18eb51509c7a3432af73308f8be578ef SHA-1: ceacc21177e3574f01de1fff7b238bfb1d9a338c SHA-256: 28c4066ba6d76901b94f33ba9df56cdc57392ded93faa1791b4029a888f3a9f1
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various external PDF files hosted on disposable domains and link farms. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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 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.
  • 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://crophysi.ru/strik?utm_term=rm+vs+rm In PDF document text
    • https://cdn-cms.f-static.net/uploads/4451949/normal_5fda46602eed7.pdfIn PDF document text
    • http://getporte.xyz/powerscore_gmat_critical_reasoning_bible_2020wjwh0.pdfIn PDF document text
    • https://kenuzoba.weebly.com/uploads/1/3/4/0/134017938/jutaselik.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/idWTjgW/cake_recipe_from_scratch_no_eggs.pdfIn PDF document text
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/zijelasakano.pdfIn PDF document text
    • http://prizinsta24.space/33155224612ugjew.pdfIn PDF document text
    • http://fc-aromat.ru/ruxupuliguvejexoleveitbql.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_600d0c91cacba.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/kakodekolovivo-jolotu-fixiwobibemake-komuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5ff4152b239d6.pdfIn PDF document text
    • https://zumofimuletoxol.weebly.com/uploads/1/3/4/0/134018509/tijezedakapinal-ponenimob-bemunuradifole-litolizusavo.pdfIn PDF document text
    • https://cdn.sqhk.co/vibesadebo/jbibgdz/37309824545.pdfIn PDF document text
    • https://bitilidejiv.weebly.com/uploads/1/3/4/4/134442737/rotimevudemo.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://vbnmcxz.xyz/schaums_outline_of_college_physics_9th_ed_solution_manual1dahh.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/ehdJiaZ/47853982604.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 4656 bytes
SHA-256: eade8ea0dcc1de5b369c606f33c15dd44cd6b9784d65740d41074b136080f41a
font_01_sfnt_off00010a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 11544 bytes
SHA-256: f172435720d0f613d8c2e911e3a1e776d6ff3666762ec894ea7b8c310661c8b3
font_02_sfnt_off000131c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C1 16232 bytes
SHA-256: 97dfd5019501f23c63d119256cc9411ccc51cdc9e98ab6c60b5cbde597b43a1e

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