Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8e7f924ead3115…

MALICIOUS

PDF

77.1 KB Created: 2021-03-18 19:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 03acc641da574a7d62c537c633e1d793 SHA-1: d94d270d98f284aeaac10273ab7ecd863add820b SHA-256: bf8e7f924ead3115c4f381bfda1f41087c82cc73315649bddf0088f5011654b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://dafemum.ru/strik?utm_term=kenmore+elite+top+loader+clean+washer+cycle PDF link annotation
    • http://nujagexurej.medianewsonline.com/71371728764.pdfIn PDF document text
    • http://zexorusawuwurew.sportsontheweb.net/18377870854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_6044d13a7898c.pdfIn PDF document text
    • http://goldalbum.ru/samsung_50_inch_full_hd_led_tv_price_in_indiaom6z2.pdfIn PDF document text
    • http://klokisik.space/find_my_friends_reporting_wrong_location6cd4p.pdfIn PDF document text
    • http://job-finder.space/what_language_does_the_mandalorian_speakvqapm.pdfIn PDF document text
    • http://santecmb-sarl.com/what_does_it_mean_when_you_hear_a_bell_ring_3_timesrp4k8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_604f8d0d68090.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_6731526c2d7b4028a1acd6e4fd128d85.pdf?index=trueIn PDF document text
    • http://novogizeboje.myartsonline.com/ostrich_farm.pdfIn PDF document text
    • http://benamow.myartsonline.com/dogikaxebuwaso.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/gloucester_county_special_services_salary_guide.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_8170b1068d7643be819e31c326e6b706.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/aicte_approval_process_handbook_2018-_19.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_3792941c102447e9b28e8cb88bdf0a3b.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_606dc5737539474086fe5ff0a85c2acc.pdf?index=trueIn 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_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 5476 bytes
SHA-256: 03f4b6b00b7a239dbf4266b1058fcb7674f33d92b8333f59331d65b56aba144a
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 11588 bytes
SHA-256: 5e364b48cc4e337807a40484b502c1e231c2987706bd78d84f8f429e515f3d4b