Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecaa41ac4458ac0…

MALICIOUS

PDF

86.9 KB Created: 2021-03-17 09:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: df11dc09806008d33a112c5d74b8baff SHA-1: 940114a6dd37f62f9ab3b1eb78e3bb6670551fc6 SHA-256: eecaa41ac4458ac0d4a0301dfa7c16b99ac70997076fb322a5b56906a88095e1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

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
  • 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://mezovuduw.ru/123?utm_term=atlant+bootstrap+admin+template+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383805/normal_601df9bf17ab6.pdfIn PDF document text
    • https://cdn.sqhk.co/xesagomi/09jczwB/7998660403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_603e86f0d26f2.pdfIn PDF document text
    • https://cdn.sqhk.co/vamosopon/OhcOmgg/nerf_zombie_strike_doominator_blaster_toy_weapon_gun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_6039ab817cc68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488101/normal_5feeefb34e7a7.pdfIn PDF document text
    • http://gelivebun.22web.org/what_are_all_the_lights_in_the_sky_tonight.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dizogusuvi.rf.gd/25268777806.pdfIn PDF document text
    • http://daxijofasazavod.rf.gd/afghanistan_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a6bc332-20a0-4a4d-b5b6-b8718ce45f02/is_wendys_spicy_chicken_salad_healthy.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_51507182590b4d64b3b89ece2097292c.pdf?index=trueIn PDF document text
    • http://ledugezutixajo.epizy.com/lagu_thinking_out_loud_chords.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_d3ca7c5e42954f90b2105050f4038664.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ace349-6e66-47e1-8c58-faba3baea360/ginagimawagefipude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde48e6b-69c6-4fa3-997c-1935a9c36c05/soginenevaxiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df465eb-7d9e-4526-b39e-71325e103c34/73106993370.pdfIn PDF document text
    • http://kexeban.rf.gd/did_aris_die_in_scorch_trials.pdfIn PDF document text
    • http://fovorixeduwudu.epizy.com/19469300091.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_off0001102a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 5316 bytes
SHA-256: b219e68d2d74b06b0116baade725f2050e6215f1c5938d5bc7118d471c2340fb
font_01_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 16752 bytes
SHA-256: f6be911ccced1d90e95f33bd3d768bd28e2040c9caaa9526f7ec8c10d45e1606

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