Malicious PDF — malware analysis report

Static analysis result for SHA-256 71df13fd65720c21…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 14:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a4cc9d1ba96be90086db4b54b736fc5 SHA-1: 8178df2feda3002929e33f093456c12384021440 SHA-256: 71df13fd65720c21971396cca646d6729f37c7f7ddfd90c5f7a2d168bf2041cb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and numerous URLs point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=sellamiento+con+la+sangre+de+cristo+para+la+casa
    • http://myluckybet.xyz/how_fast_does_a_honda_rebel_300_gogqk41.pdf
    • http://bathforlegs.xyz/kunotugamijevedekenipoddsv.pdf
    • https://cdn.sqhk.co/daposofoxig/Ridiihc/smart_pulse_survey_app_5._2_download.pdf
    • https://static.s123-cdn-static.com/uploads/4451940/normal_5fff963eb1cfa.pdf
    • https://cdn-cms.f-static.net/uploads/4470221/normal_6059a40e57ba6.pdf
    • http://repair-foto.ru/ford_6.0_powerstroke_oil_capacityfsy95.pdf
    • http://latuha.com/14810999716z0y0y.pdf
    • https://cdn-cms.f-static.net/uploads/4403565/normal_6032d38fdd75e.pdf
    • https://cdn.sqhk.co/tinulafi/je6dVii/74894942051.pdf
    • https://cdn.sqhk.co/muwazubivotu/iTZyjdt/formula_1_qualifying_results_italy.pdf
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5feaff3e9f851.pdf
    • https://cdn.sqhk.co/poladejug/KvhdTjd/movie_download_manager_for_windows_7.pdf
    • https://cdn.sqhk.co/nutanujel/jigiPj5/this_is_the_police_2_ps4_metacritic.pdf
    • https://cdn.sqhk.co/pevejotomoma/2BicfGQ/9round_pulse_login.pdf
    • https://cdn.sqhk.co/sunidoxil/drdjahg/40616698926.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_1049f2f9ebd44eefa744780954d10141.pdf?index=true
    • https://9169454a-6e45-4b39-89c4-5cd9bf0a6084.filesusr.com/ugd/32fbc8_4160b53c58c14e57baeae260968e9189.pdf?index=true
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_b5b7b6efae074f71863d066371361a8e.pdf?index=true
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_81f915cc1482408eaecac83741f67bfd.pdf?index=true
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_386bf7d5d11f4c859402674467a86214.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f087.bin
34a9bf17dc69f956c4b6f5ad63138c23d811e58b2c560292aed6eff5fd409566		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 5496 bytes
font_01_sfnt_off0001031c.bin
8115158b9e7cc83feec2ed1087353949d33fa9f6256bb9b9308010c11d2e8641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 11896 bytes

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