Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca05841dfa92339d…

MALICIOUS

PDF

78.0 KB Created: 2021-04-13 11:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdafe2faafc2c9773678c24823fb1de3 SHA-1: 7773d81c9b664a093d1358665d5fa1755830137e SHA-256: ca05841dfa92339d1e5cb245c5102608db852ca8c0a4eea0d77a36fde3ffc01b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this as a phishing or malicious PDF. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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=homelite+hb-180v+leaf+blower+manual
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/1314758.pdf
    • http://xubabutogazide.22web.org/aritmatika_sosial_kelas_7.pdf
    • https://xusezazidajitov.weebly.com/uploads/1/3/5/3/135325201/jivafolewibo-bulizixufobuv-kirix-vajafidom.pdf
    • https://cdn.sqhk.co/tiruxugajo/GY1bhhD/metropolitan_fiesta_5_theatre_santa_barbara_ca.pdf
    • http://balewezekowesab.iblogger.org/bioassay_principle.pdf
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/dinotoxutapadi.pdf
    • https://cdn.sqhk.co/mofipife/dgihjjg/wazowevetizefobe.pdf
    • http://tuwosip.iblogger.org/carter_page_fisa.pdf
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/8789697.pdf
    • https://dodemitewiv.weebly.com/uploads/1/3/1/3/131380707/temoxisim_letolomutujafes.pdf
    • https://cdn.sqhk.co/wugolekufo/ibaigr0/commercial_free_oldies_radio_online.pdf
    • https://burakatotofok.weebly.com/uploads/1/3/1/8/131871829/pogirinesom.pdf
    • https://cdn.sqhk.co/vumivatuvi/jdhdJij/run_third_party_apps_on_mac.pdf
    • https://tinuwese.weebly.com/uploads/1/3/5/3/135300683/e63831751db8e6b.pdf
    • https://kizuwapeputatu.weebly.com/uploads/1/3/4/3/134375201/7389608.pdf
    • https://dofopukirisozut.weebly.com/uploads/1/3/1/4/131437491/9651823.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1bc2da55-d9f9-46f5-9d67-b48dc82c85d4.filesusr.com/ugd/957ce7_dddc8c59571a4b7695801a25d45166fb.pdf?index=true
    • http://watenumedar.rf.gd/certified_fraud_examiner_certification_in_pakistan.pdf
    • http://xafafogaditeki.rf.gd/the_greater_good_ciaphas_cain.pdf
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_54486deff55646449470fcc9f01c95ed.pdf?index=true
    • http://lagixilutami.rf.gd/aadhar_card_by_using_mobile_number.pdf
    • http://nokefibazapowem.rf.gd/adenoma_hipofisario_diagnostico.pdf
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_996fe9403df04c61ab7f885b51d751a3.pdf?index=true
    • 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_off0000f325.bin
d09a8d9480b37c0c78e5d3882ff678bc1c9e9e4028eaea35a8c57314e7f67c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 5500 bytes
font_01_sfnt_off000105cf.bin
741d779fb3db7529a25b56693cc350f2c3563dd2734922d47994d0d9dcd62de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 10836 bytes

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