Malicious PDF — malware analysis report

Static analysis result for SHA-256 a007b38d3e5d9f42…

MALICIOUS

PDF

90.0 KB Created: 2021-03-19 17:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 85ab5a183cb7fc84325bd8b2c04a23f6 SHA-1: a457088e516faa3986b631dbaaf0ef9b09fd2575 SHA-256: a007b38d3e5d9f4239a9cddde4fcc6240d572c4ea16d032f0d550c9642845b32
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to disposable domains, identified as a link farm. This behavior is indicative of SEO spam or a phishing campaign designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/123?utm_term=brisingr+christopher+paolini+pdf PDF link annotation
    • http://uchebnoe.website/pizaku9n9l3.pdfIn PDF document text
    • http://magic-world.site/cuanto_es_30_gramos_de_leche_en_mililitrosn8elv.pdfIn PDF document text
    • http://verifybadgesbusiness.com/sajoz2yihd.pdfIn PDF document text
    • https://xixolediz.weebly.com/uploads/1/3/4/5/134513169/dovefejovunofeko.pdfIn PDF document text
    • https://pifodepap.weebly.com/uploads/1/3/4/2/134235937/tosolef-pomamorul-fulinozapemepux-vugasazurif.pdfIn PDF document text
    • http://jepegupunu.mygamesonline.org/cen_01_2020.pdfIn PDF document text
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/detawuw.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/d1e885f66f999d.pdfIn PDF document text
    • https://zimazegikej.weebly.com/uploads/1/3/4/7/134732290/9444fa5d5.pdfIn PDF document text
    • http://moscow-siberian-force.online/24259061455fx7qr.pdfIn PDF document text
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/3305582.pdfIn PDF document text
    • https://cdn.sqhk.co/rivinodati/ajddBBJ/95951421779.pdfIn PDF document text
    • http://mon-cmso.best/badland_mod_apk_revdlfaatr.pdfIn PDF document text
    • http://rasipafus.getenjoyment.net/rc_plane_design_basics.pdfIn PDF document text
    • http://webmastervlad.ru/bilewunerevotogijipedatkfm4.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/buvikevinoberog-gijapi-xawemex-bubarusaru.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/Jagjwjf/kiko_run_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/dovumisiwe/YF1VhfM/16978088498.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/ginirodufelevedikos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00012245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 5468 bytes
SHA-256: a0acc742feed80a55957620c2bc1f3e04c37ec0427ac1d1795f7a0df746a3f82
font_01_sfnt_off000134de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DE 11300 bytes
SHA-256: 0f1fc905866688e57b3a6873959de99b8fb0b7033a71e69453210109109b8f56

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