Malicious PDF — malware analysis report

Static analysis result for SHA-256 59734bc3f5063dda…

MALICIOUS

PDF

71.9 KB Created: 2021-03-28 11:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a7949f44731a8125a337ebbfd4b62da7 SHA-1: 4f0c0f55962869ddd5ad7c852d80f161f1fd6ae6 SHA-256: 59734bc3f5063dda41bec91f45cf14c077c9d3aad5a529f736625398cbd57428
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

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://xajibur.ru/123?utm_term=annabelle+creation+full+movie+in+tamil PDF link annotation
    • http://superheatbelt.xyz/spanisch_lernen_gratisev8cw.pdfIn PDF document text
    • http://sesalon.xyz/hamlet_act_1_scene_2_soliloquy_analysisx6fmp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_603cb887c99e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497093/normal_5fccd98eda0c2.pdfIn PDF document text
    • http://expressday.online/vopoxede9i8gz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_601094742114a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444630/normal_5ff62d5d85c44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458618/normal_604ee254107a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6056c3da8293d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_6058a9c95864e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414695/normal_5fc911446f41d.pdfIn PDF document text
    • http://zeropium.com/30_day_no_sugar_challenge_resultsucigl.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/nimuwet/bloody_roar_2_psp_free.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/state_of_illinois_llc_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/peruwopabe.pdfIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_cd3b32e5666947d081fb99ba1ac01951.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_efef744921b049ca890b7ca7a9bc35aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/padag.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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 5040 bytes
SHA-256: a27356c9525c2ba52bfbbb29b97f97b54210198d646ac0da6a7eb8ea2a4205fa
font_01_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 10944 bytes
SHA-256: 5f39f4195c206c14f64991a9cde1b9553bbe8a58722955fa2e8e5dbb18e3b6f4

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