Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d0f1c8f3eb54b3a…

MALICIOUS

PDF

75.2 KB Created: 2021-03-26 12:13:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f60d265594b44b8f22bc25e5063e426b SHA-1: 29e13edbc5eb9f0d3c607d8fe1c9f8cc4bc57c9e SHA-256: 0d0f1c8f3eb54b3afee13605246da618306f2f38299009f0d6d22df0652da92a
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, identified as a PDF link farm, with the primary suspicious URLs being jumiwimov.ru and cdn.sqhk.co. While no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=god+bless+america+sheet+music
    • https://cdn.sqhk.co/susojareb/HSghF3U/car_simulator_2_cheats_ios.pdf
    • https://cdn.sqhk.co/forinabam/cFlhggf/29162638674.pdf
    • https://cdn.sqhk.co/juzurupivepo/cjdfNcj/rt_news_tv_live_arabic.pdf
    • https://cdn.sqhk.co/surixirulol/OhcgjbZ/90955190701.pdf
    • https://cdn.sqhk.co/niririga/hiibRID/mafizobuwub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xoferuzu/jexovi.pdf
    • https://uploads.strikinglycdn.com/files/5f3de801-76f3-4398-90c1-8d80eb1f5d2a/rubodavepugonedu.pdf
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_c43710bc81d34a02829910a9ae2ca9cd.pdf?index=true
    • https://s3.amazonaws.com/rufonali/data_analysis_statistics_icon.pdf
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_153a7b0d52d8476f8a0aa762c5556464.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3cd2d7d3-a985-4305-993d-1050559f0fe9/gajudugos.pdf
    • https://uploads.strikinglycdn.com/files/4fc9136d-3896-4dc8-8079-4cb421a292ce/wowiri.pdf
    • https://s3.amazonaws.com/filidabut/diborozibozej.pdf
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_9cfdda0382db487da9df499cbba685f0.pdf?index=true
    • https://s3.amazonaws.com/kezemiradigu/gawoxikavaduzopu.pdf
    • https://uploads.strikinglycdn.com/files/af0d019e-e11b-49fe-9c98-0ec83923114d/craigslist_dayton_rvs_for_sale_by_owner.pdf
    • https://s3.amazonaws.com/nitizobuv/inteligencia_emocional_caracteristicas_yahoo.pdf
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_7f27d10f1f51459cbcaa359bdc1bc144.pdf?index=true
    • https://s3.amazonaws.com/jizubisetebof/getting_to_know_arcgis_5th_edition_free.pdf
    • https://uploads.strikinglycdn.com/files/424b926c-cba4-46a1-8667-8d668374a22c/zetefomefalalojikuji.pdf
    • 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_off0000ea62.bin
cd5fe2cf5e9a414ddef73c901efd2f8f10b19f15da15ca3e16f53dda7dc9de3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 5348 bytes
font_01_sfnt_off0000fc61.bin
5df0c46748f774a3a86568653344af2460a21916412905cef58a0457cce28268		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 10700 bytes

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