Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83b5b6e4fb35c02…

MALICIOUS

PDF

61.8 KB Created: 2021-02-23 04:01:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8bf2f8b06f5c58f957371387467151f5 SHA-1: dfbf6234c7aeaa6dc8b3a3d5b4c47380c7cf3b11 SHA-256: f83b5b6e4fb35c025f0be857d65d5833ce8888a88eb659dc00d54adae5621c54
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack designed to lead users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=dodge+42re+transmission+rebuild PDF link annotation
    • http://gufopitasuwo.22web.org/bagger_288_transformer.pdfIn PDF document text
    • http://itawomen.fun/dartol_s_rod_of_transformationqcmrd.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/hdLhbii/manchester_by_the_sea_movie_review_rotten_tomatoes.pdfIn PDF document text
    • https://cdn.sqhk.co/bawijodol/idmj1hx/23683075691.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/getOgji/jobabetaruxor.pdfIn PDF document text
    • http://draiwenstore.online/brothers_mp4_video_songs_pagalworld._comxu6g8.pdfIn PDF document text
    • http://scarcebook.com/zitefujotazomebawad5jinv.pdfIn PDF document text
    • http://xeboxemovev.66ghz.com/self_rating_depression_scale.pdfIn PDF document text
    • http://figojusu.iblogger.org/michigan_child_protection_law_mandated_reporters.pdfIn PDF document text
    • http://cabinetshub.xyz/acer_aspire_e15_charger_price_in_sri_lankaiz0dn.pdfIn PDF document text
    • http://xilutemomeliro.iblogger.org/aimer_romo_et_juliette_partition.pdfIn PDF document text
    • http://mgacessoria.online/272836919749ua34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tijeluko.rf.gd/convexity_and_duration.pdfIn PDF document text
    • http://zeluwaboder.rf.gd/teremeforigifefumase.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_off0000b47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47A 5504 bytes
SHA-256: 8f3f2abad68429e273f320bf01a86aa54a71cee95a61108e36339bbdc5bdd99a
font_01_sfnt_off0000c720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC720 10388 bytes
SHA-256: e89cc2e94216cd26b041b94e4f3699deabf95ad725705fd5976008e57520c083

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