Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca39b39cfdfccd86…

MALICIOUS

PDF

81.6 KB Created: 2021-03-07 13:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7e3b0e3076252337854f0006c36cebe8 SHA-1: a4d612b5459cca69e531a3cb82bfb1260f0b4546 SHA-256: ca39b39cfdfccd864d4250d0cf6a2148f124d22c0e0298cc4d804ff441101af1
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. The presence of numerous links to disposable domains and the specific URL structure suggest a phishing attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/strik?utm_term=neofect+smart+board+cost PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424662/normal_5fe3e99fb5827.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/53837163478.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5fefe69fe16e6.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/zofawazunivixu.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/91129854381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_5fd1d2506c4b1.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/how_to_be_an_iso_9001_certification.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/19410238594.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/68461283506.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409248/normal_6007d042b46f3.pdfIn PDF document text
    • http://pristav.pro/ubiquiti_nanostation_loco_m2_firmware_5.5.6hpb0l.pdfIn PDF document text
    • http://kobopez.mygamesonline.org/zusonilusojofuwojipuro.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/xivigenosajilipovobopur.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/how_much_does_a_gas_oven_igniter_cost.pdfIn PDF document text
    • http://aslixan.com/katya_elise_henry_workout_freeh4bel.pdfIn PDF document text
    • http://help-copyrightservice.xyz/metubuletuxejiz5jhbw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489607/normal_5ffbdfada22f9.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/fufeviz.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://s3.amazonaws.com/lazolu/49796145750.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/puzuwiripumomoguka.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/2014223267.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_ec0c46e94f2b4c0386030a0eba283cdc.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_8bc038bd8cba4553aa0cb57d9442fe67.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_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 4880 bytes
SHA-256: f213451138207e2ec59d5def7ec0821bd7cfaa8114a76f30c5ebb8c8923dc0f2
font_01_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 10768 bytes
SHA-256: b006375b1440b6d37191d97ec6d5f2edade03a57677ecee0e0a5e564144e4ef0
font_02_sfnt_off00012afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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