Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff62881641a5ddb6…

MALICIOUS

PDF

96.1 KB Created: 2021-05-07 10:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4b7291ee0e5cb6fed7a807dcc22358b5 SHA-1: 11474715dee4c3aab45c7e1fcaea57aec51edb82 SHA-256: ff62881641a5ddb6e44273133c39c8cfacf445337ecbf6a53383c4e917c1ada9
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 0.9990

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://xezojetit.ru/strik?utm_term=is+there+going+to+be+a+new+wii PDF link annotation
    • http://xoxeluwanogevi.22web.org/vocalise_rachmaninoff.pdfIn PDF document text
    • https://kererivodukeje.weebly.com/uploads/1/3/5/3/135303009/8591770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380395/normal_5fd05cc470819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fcad11cd9879.pdfIn PDF document text
    • https://nobopejulalajib.weebly.com/uploads/1/3/4/6/134621416/7333335.pdfIn PDF document text
    • https://tevuratoza.weebly.com/uploads/1/3/4/0/134019225/c5468bbbbf274.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/nuragew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fee520198d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_602b99f025b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fd662188f8cf.pdfIn PDF document text
    • http://talajifit.mywebcommunity.org/62051721713.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/what_is_the_form_ssa-1099.pdfIn PDF document text
    • https://zezogilak.weebly.com/uploads/1/3/0/8/130874046/lafefaziwupi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sinusisokopex.atwebpages.com/ancient_egyptian_civilization_history.pdfIn PDF document text
    • http://terezeso.epizy.com/angiotensina_definicion.pdfIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_98aa4040865b4f9683a2e99522a7a6be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c90b68-a560-4f56-900e-a9673f1bf9da/tippmann_a5_upgrades_and_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55cc2077-7e0c-46ad-8fcb-44f0269e7b35/3308451053.pdfIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_2347546318ce49bb842bd0dddb9c95b3.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_30fa75d5a5c24f90acb5fcc54e6fb1c2.pdf?index=trueIn PDF document text
    • http://ratesedefavure.epizy.com/9392880409.pdfIn PDF document text
    • http://kimawawasero.onlinewebshop.net/professional_assembly_language_richard_blum.pdfIn PDF document text
    • http://zefifimagami.epizy.com/a_to_z_odia_song_ringtone.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 4872 bytes
SHA-256: 874d2324dccdef8c28f1b843c2e2bc1d786198982e297f913e8e091a8ce9bb2b
font_01_sfnt_off00013cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBE 12064 bytes
SHA-256: 19da45e328f0c4444cc5fcfabacdaf9084dcf8af5c53d5e0405dd0826ce04da2
font_02_sfnt_off000164ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164EA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3