Malicious PDF — malware analysis report

Static analysis result for SHA-256 c175903ffbf951e3…

MALICIOUS

PDF

79.0 KB Created: 2021-03-02 15:34:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 759146c820a04d157f861f24861343a2 SHA-1: b45d957cd96994cc8b4f9891e6294db31eba1874 SHA-256: c175903ffbf951e3fd94efd0bebd50157203e948fa79d2e40f757b52aa3e6c08
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to a suspicious domain that appears to be a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

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
  • 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://jumiwimov.ru/strik?utm_term=quantum+physics+questions+and+answers+pdf PDF link annotation
    • http://pokulumaj.iblogger.org/42852109963.pdfIn PDF document text
    • https://cdn.sqhk.co/xenekifa/dVhiBB8/36673403399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5fdb8f8de5dff.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/iaNeibv/kubicki_draper_jacksonville.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/liflgaK/call_of_mini_zombies_hack_apk_2018.pdfIn PDF document text
    • http://zevixoleg.iblogger.org/10147719369.pdfIn PDF document text
    • http://fujepopini.22web.org/coping_with_grief_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/dAdwicd/40178397128.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bubexixan.epizy.com/ccile_mclorin_salvant_dreams_and_daggers.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/diwawatabamiribisi.pdfIn PDF document text
    • http://sejojoxo.epizy.com/lithops_aucampiae_kuruman_form.pdfIn PDF document text
    • http://puxetixunelotaz.epizy.com/fusupapuwat.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/t_lockett_injury_report.pdfIn PDF document text
    • http://xejarejunap.rf.gd/resepipajubodojenuxusopof.pdfIn PDF document text
    • http://suzefomon.rf.gd/caesar_3_android.pdfIn PDF document text
    • http://vubimebuno.rf.gd/chick_fil_a_job_applications.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
    • 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_off0000e2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 5744 bytes
SHA-256: bde66da727b77512a9e88cdf9c4eb06edba2dfb2252701aad2769d129f0a6e65
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 10408 bytes
SHA-256: ee54f3f9838cf3d804792f07d6ca8e9a5a5e761c0d5e0b10e9c6208bf8aa3869
font_02_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 16028 bytes
SHA-256: 13adf508137d8c465935a7a142060f5d940462760dc3fd3f5061e956d2f2222b

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