Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7658d19ab3d6276…

MALICIOUS

PDF

87.6 KB Created: 2021-03-31 19:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc24584201fa5af8ed6ca1e368165fce SHA-1: 1871699593e09e8cd2712330f903b5967b054658 SHA-256: b7658d19ab3d627613324bceac5cc2e33324478a7ded9b6af879842a04d0e567
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful sites.

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://zajinet.ru/strik?utm_term=hp+elitedesk+800+g1+drivers+windows+server+2012
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/pigaduli.pdf
    • http://tulumiv.medianewsonline.com/32812455157.pdf
    • http://vosojivaru.mypressonline.com/how_to_fix_a_sunbeam_heated_blanket.pdf
    • http://vaxiliwu.medianewsonline.com/67098991944.pdf
    • http://silkhfig.bid/tatapalogebizufumjo8z6.pdf
    • https://tagipuzato.weebly.com/uploads/1/3/0/7/130776724/sowogutoxodusanu.pdf
    • http://monstergym.ru/history_of_education_questions_and_answerst7u5j.pdf
    • https://fifuvifelikedub.weebly.com/uploads/1/3/4/6/134662232/begujomubezinumapax.pdf
    • http://fepaporipevari.mypressonline.com/how_to_change_google_maps_fastest_route.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_27d5ceeb0c59408cbce36946f3b70d25.pdf?index=true
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_cf989a7383fd4ba8bf5b29077194fa19.pdf?index=true
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_0b5f960add154dbc81b009bccb2e5a82.pdf?index=true
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_c50ac4782c81438e8505ad7aadeba385.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cf2d511c-827d-4353-b921-adb2c7114427/78364385345.pdf
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_dd60c7fe54064e29a659441c5fec157b.pdf?index=true
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_eb6558289a7449e2b58f25b6ddf8e73c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/993fe371-b283-473d-94f2-651cd6bdb7fe/ponto_de_encontro_2nd_edition_student_activities_manual.pdf
    • http://pikubub.onlinewebshop.net/lonely_planet_guide_pune_india.pdf
    • https://uploads.strikinglycdn.com/files/78d65997-902e-4b82-a785-5487628d64af/trane_cleaneffects_installation_manual.pdf
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_c090938bd44844d2900fe2cafdaaf738.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_off00011595.bin
4a8ac4db746285269c874a525449d85773dae9e66d989c1bf60524d26dbaebc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 5612 bytes
font_01_sfnt_off000128de.bin
8df40169bb3c8c2c1425a270e2ef2367dca3801f30394091f7304271a4391754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128DE 11968 bytes

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