Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb927225ad95cbe7…

MALICIOUS

PDF

75.8 KB Created: 2021-02-15 23:34:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c09f1c82ca424f76d535438513326a98 SHA-1: 2bfed9914782c328a4ebd9bcad26d850a1ba8302 SHA-256: cb927225ad95cbe7245f74dd3dd1871e02e629d51d7d48cd54f24cfd8a18f3a4
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=data+security+jobs+salary In PDF document text
    • https://kixovojowabib.weebly.com/uploads/1/3/5/9/135966002/kowujurujutow-bizadobojamixu-modorodoza.pdfIn PDF document text
    • https://tebeneka.weebly.com/uploads/1/3/0/8/130874559/0f918c80bae7.pdfIn PDF document text
    • http://1offpark.xyz/bitimegizisa0tb2y.pdfIn PDF document text
    • http://gopumapi.iblogger.org/fovexelulutoxoxotedun.pdfIn PDF document text
    • https://sipigatijuk.weebly.com/uploads/1/3/3/9/133999294/3b9ad7300c6.pdfIn PDF document text
    • http://sokolov.fun/ice_cream_cake_frosting_carvelhgtcr.pdfIn PDF document text
    • http://fruit-ital.space/dorotesozugunazejubobo18epb.pdfIn PDF document text
    • https://mogivara.weebly.com/uploads/1/3/2/7/132712472/a003d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_6006a32c8433f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vazorilumi.epizy.com/norisuxigiwokod.pdfIn PDF document text
    • http://fudixuxutinizow.rf.gd/41521123454.pdfIn PDF document text
    • http://nisinukodepafix.rf.gd/boolean_logic.pdfIn PDF document text
    • http://gafevudivexer.rf.gd/15507057305.pdfIn PDF document text
    • http://wekijedi.epizy.com/pirozopira.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/66350130933.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_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 5112 bytes
SHA-256: 5bd33e5ce25d908c839b1056db019904a66ea232c0b8c6e19a1f140b1e228f5b
font_01_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 10352 bytes
SHA-256: b308505d212d6052ffb0be1b2d067aba808e699de879aa1f8d9c14f626a9546a

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