Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cd3e4d3fb17686…

MALICIOUS

PDF

76.6 KB Created: 2021-03-01 03:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f46224adf60e03e3f6fa89a462e4ba7a SHA-1: 287aae4ba150abe19717f272a4aa560408f9a89d SHA-256: 18cd3e4d3fb17686cd84cea43ddcdaa103f37936209d6ddd2f473e3ecf942458
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://soxebez.ru/strik?utm_term=gold%2527s+gym+xrs+20+olympic+workout+bench+and+rack+dimensions PDF link annotation
    • http://varerafuvurine.22web.org/49082671137.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ifR3Mua/pro_bowling_on_tv.pdfIn PDF document text
    • http://cashbackk.site/what_element_is_in_all_living_thingst7u1t.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/qsjjbjg/bullet_boy_movie.pdfIn PDF document text
    • http://pubgmobiie.com/arcane_quest_3_classeshfk5b.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/big4Jg4/iihf_power_rankings_2019.pdfIn PDF document text
    • http://lavawogufiwilor.iblogger.org/xepumega.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/jRugcgi/crossroads_village_benton_ar.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/Tjefghg/fagemifulerux.pdfIn PDF document text
    • http://mysteps.online/bruce_lee_height_in_feet6oayy.pdfIn PDF document text
    • https://dunawotota.weebly.com/uploads/1/3/1/4/131438316/gegijejomujo_josusilaxab.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/bukazererovu.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/icgeRmh/potion_punch_sun_scroll.pdfIn PDF document text
    • http://giocodigital.website/vuzemokijunumavof8i1a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibipadesubamom.epizy.com/simple_education_website_templates_free.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_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 6292 bytes
SHA-256: f46b20ba3b28fb9c9c8f8d6dee9aa6115bb60595ed2f476b13e5c377481a0656
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 10908 bytes
SHA-256: 386f273c133728a9347b2d672936e5ad0de580b86232b90c7803f1e9b7bacc53

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