Malicious PDF — malware analysis report

Static analysis result for SHA-256 389b334ba914db48…

MALICIOUS

PDF

76.8 KB Created: 2021-03-26 10:37:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f92751c687b1095ca7de14b1440330a6 SHA-1: a6ca64711539972aa78cd978bdcf9999539c0ea3 SHA-256: 389b334ba914db4805ac9d5f082fdacd04e05861670ce3f2b54732c0c882f70a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of external URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' point towards a phishing or malicious redirection scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=what+can+cause+your+washer+to+stop+spinning PDF link annotation
    • https://cdn.sqhk.co/puxedimuwo/fjfAggx/irctc_login_ticket_cancel.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/gggdhbl/bazebikipoxemorakot.pdfIn PDF document text
    • https://cdn.sqhk.co/livulopo/lsRhbRq/steel_and_flesh_mod_apk_download.pdfIn PDF document text
    • http://f1l3download.site/marley_and_me_movie_onlineh7wmc.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • http://tusapet.iblogger.org/36430393732.pdfIn PDF document text
    • http://xigosilefonaboj.iblogger.org/81172752528.pdfIn PDF document text
    • http://funapuz.iblogger.org/early_civilizations_chart.pdfIn PDF document text
    • http://rirarojafetojep.iblogger.org/19613863021.pdfIn PDF document text
    • https://cdn.sqhk.co/pozusonitid/cZejbY4/nabasozulezamik.pdfIn PDF document text
    • http://probkin34.xyz/pharmacology_made_ridiculously_easy7gxat.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/gXjaTge/dual_citizenship_in_usa_and_ireland.pdfIn PDF document text
    • https://tenagudewujuga.weebly.com/uploads/1/3/1/1/131164273/metumiluw.pdfIn PDF document text
    • https://xodalolekuxol.weebly.com/uploads/1/3/4/1/134108590/subok_sewifurejatu_xogunoragupib_zuxife.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/sigegulalilu7mef7.pdfIn PDF document text
    • http://prequester.online/kusofexoxoluwqn59b.pdfIn PDF document text
    • http://liko-sneakers.com/31756622390dpqcv.pdfIn PDF document text
    • https://cdn.sqhk.co/nelufebo/iewrfoM/33025326250.pdfIn PDF document text
    • http://kozizukexepuf.22web.org/tuzitujivujaligodopujilog.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/hceggR0/gosaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijinisefiregot.rf.gd/rimexejuviru.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_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 5368 bytes
SHA-256: 4bfd33ef546965dd936c86a68140429a8225f2dd1d1df56a4f852520593e3ad1
font_01_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 10500 bytes
SHA-256: df502e154e8e91b6c656bb93d9296d4e47b1b7cd9f70b779180b2b17ce9af55a

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