Malicious PDF — malware analysis report

Static analysis result for SHA-256 748eaf692e9f0d87…

MALICIOUS

PDF

66.7 KB Created: 2021-02-22 02:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6f59466647766ab33628539ba1b1afca SHA-1: cb8e03fc17cc1a2a003e6342316add90565c9690 SHA-256: 748eaf692e9f0d8709cbb4bbf1530c69db37440b568413d4fa5731b16b67d4ad
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests it may be used to conceal malicious payloads, requiring users to download an archive and potentially provide a password. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/strik?utm_term=esl+library+answers PDF link annotation
    • https://cdn.sqhk.co/mepapogivoma/gfOijji/air_fighter_pro_mod_apk_offline.pdfIn PDF document text
    • http://shoop-fm.ru/dajifojexupanosewaf95.pdfIn PDF document text
    • https://pabametutib.weebly.com/uploads/1/3/5/3/135317572/4407205.pdfIn PDF document text
    • https://cdn.sqhk.co/kipebakebe/hKVb5gf/heroic_definition_synonyms_and_antonyms.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/UBjeDhi/big_bang_theory_theme_song_full.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/ZEigqhe/12009981410.pdfIn PDF document text
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/gadexe.pdfIn PDF document text
    • http://baugroup.info/52037558723zg6kn.pdfIn PDF document text
    • https://bopelesi.weebly.com/uploads/1/3/0/8/130874615/xopusal_zoriwidedax_xesadipajekoj_zurifuxep.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/hgQjhKt/webibejaxevabolaxawiboxu.pdfIn PDF document text
    • https://cdn.sqhk.co/vazodowadu/ifiiohi/30002519132.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juwemijawikipo.epizy.com/game_bleach_vs_naruto_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/airserver_android_to_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/92634305282.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/felelitalimasaba.pdfIn PDF document text
    • http://bezukovopobav.epizy.com/nugabalobiguzegu.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/16564094135.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_off0000c836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 4968 bytes
SHA-256: 8ac391bb82e31e17914590fcf998f31bb30c8eb0fc08beb48fc1f81ac94d4158
font_01_sfnt_off0000d943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD943 10976 bytes
SHA-256: 72a7b8a70e37b528d1e51792b92b9a57257eafa2632cf7272326291ee2458506

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