Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7518b2ed7513e9…

MALICIOUS

PDF

77.7 KB Created: 2021-03-05 08:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e2b85e4f0cf53b05af59fe5ae6d39ab5 SHA-1: b5207a5f2224494aef479b249ecf7943b2fcda91 SHA-256: 0a7518b2ed7513e915cc200c880b9aa1a38f77f07b351d939decab9ee44e3d3e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. Heuristics indicate a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. While no scripts were extracted, the sheer volume of suspicious external links suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=romeo+and+juliet+act+2+scene+2+study+guide+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369505/normal_5fe5449b88e03.pdfIn PDF document text
    • http://vilopeg.xyz/2014_honda_civic_service_resetxbt2c.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/Lih2xlD/freedom_stick_bolt.pdfIn PDF document text
    • http://lessonsonline.site/jowoxelagazuvutipogebew05ybs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459939/normal_602595657d61b.pdfIn PDF document text
    • http://samyog.ru/nutribullet_magic_bullet_blender_partsta1gy.pdfIn PDF document text
    • http://axecheat8.xyz/nusegebotaqq12r.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/jicUWha/zombie_warzone_call_of_duty.pdfIn PDF document text
    • http://poverkavoda.website/335561158553qs07.pdfIn PDF document text
    • https://cdn.sqhk.co/sugutomipu/eNTkghJ/xarimidumatakeb.pdfIn PDF document text
    • https://cdn.sqhk.co/japewaturu/jNWhbyD/kakenulewipodap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_19c1bdf2690a420abd9d68ab02ae0db6.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_349a1cc8235c428089daea28987125c4.pdf?index=trueIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_af4fe6091bce4a94aa63f6e0f897e1ed.pdf?index=trueIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_0fa378173fc24d92a12ff6ab2ffb4402.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_9060087e7d2a492db6f3a0b6b583112a.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_7c87a06535dd4c9a928e940c6dc2f7e0.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_62755373fa884174a94b21dff7cede0a.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_46fb38ae27aa4cc5964ecfb5259d201f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 5548 bytes
SHA-256: c0f16f7801c7394a8d4ecdbca277e853e10042aa495c113d175bedf7e03af650
font_01_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 10904 bytes
SHA-256: 3f54befa43fb868ba7b999f8459aa71af2b346d17c5095ac86a5991ea98427c3
font_02_sfnt_off00011915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378