Malicious PDF — malware analysis report

Static analysis result for SHA-256 72af5db308dc0688…

MALICIOUS

PDF

78.3 KB Created: 2021-04-13 13:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ba66d817e3329bea2db3658c4e19d6d6 SHA-1: c0540ba2fe308a9efdd73fb7f9509b63e716d9f7 SHA-256: 72af5db308dc0688421371c5bbed70ab87c7481a29219e5de2178807a5ac8eb1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content or phishing sites. The document body is heavily obfuscated and appears to be junk data, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/strik?utm_term=dr+jekyll+and+mr+hyde+sparknotes+themes PDF link annotation
    • http://qunit.space/39627552151qdrsu.pdfIn PDF document text
    • http://gayerkan.com/ap_statistics_2015_examzz4zv.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/e60e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_605d66af15184.pdfIn PDF document text
    • http://worldworkbook.com/integral_x_cos_x_sinx_dxd8rzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368240/normal_5fc7f2ce9b273.pdfIn PDF document text
    • https://nedilobimizedov.weebly.com/uploads/1/3/5/3/135346130/1675384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493597/normal_5fd3148fbf8aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470961/normal_5ff4243b59156.pdfIn PDF document text
    • https://mubisajapesufu.weebly.com/uploads/1/3/4/6/134620746/vodivewex_sovumorafu_najapiguwijiba_nudobiraj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_603033c31da9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449183/normal_605f728862eaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_603ecde3ddef8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479675/normal_5fcce0cb5b716.pdfIn PDF document text
    • http://job-finder.space/used_motorola_xts_5000_for_saleohcy3.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/9588109.pdfIn PDF document text
    • http://onsideball.info/resume_template_freepikwmvif.pdfIn PDF document text
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/danip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_94c4df3c7c5946bbba34bcb945bbf4d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/what_is_a_dress_code_policy.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_461b26fce363456fb1eaad33700fcf28.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/28810011412.pdfIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_540ee88afa114823a1e186f287197a76.pdf?index=trueIn PDF document text
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_7de38558f7d94a8bac1b294786335fa5.pdf?index=trueIn 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_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 5440 bytes
SHA-256: c4ccb293535001a185a3c166fa31509fdc817e8b0169a12b32e9d76870d51c0e
font_01_sfnt_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 10720 bytes
SHA-256: c422a41ec1685c23be8f2d93be08fd32adda4141a8c1858f3edcc8a1f8180bc6