Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac08ce5b92d72ecb…

MALICIOUS

PDF

81.7 KB Created: 2021-04-08 16:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 645919478025240819fcccaa66720efe SHA-1: b5fe8465ac1667f0c04bcd9d4b5aa7659d34b487 SHA-256: ac08ce5b92d72ecb21b8709f8e33c7ae0522640a05db9a28d824463358c19b8b
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://kuzutuzo.ru/strik?utm_term=asus+eeebook+x205ta+windows+10+update PDF link annotation
    • https://lumamiwaba.weebly.com/uploads/1/3/4/7/134735329/8275832.pdfIn PDF document text
    • https://sukanogijero.weebly.com/uploads/1/3/4/3/134333185/pedetopideledidan.pdfIn PDF document text
    • http://vitedotom.iblogger.org/98765147483.pdfIn PDF document text
    • https://wojujasomiselok.weebly.com/uploads/1/3/4/4/134487215/698aa8cd90de3.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/88af61f76401.pdfIn PDF document text
    • https://moredotaze.weebly.com/uploads/1/3/0/7/130776260/5533292.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/fekawiz.pdfIn PDF document text
    • https://mosezogojufotu.weebly.com/uploads/1/3/0/8/130813841/wifulawan.pdfIn PDF document text
    • https://jofevuwob.weebly.com/uploads/1/3/4/2/134235005/1134756.pdfIn PDF document text
    • https://torudedo.weebly.com/uploads/1/3/4/3/134352944/mabawu.pdfIn PDF document text
    • https://zulusoneruw.weebly.com/uploads/1/3/4/8/134887175/5264363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevediruzorapaz.rf.gd/retro_game_center_apk.pdfIn PDF document text
    • http://nasukenapab.epizy.com/ruruwixixejijejabena.pdfIn PDF document text
    • http://vitorozakosi.rf.gd/11574951875.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_34b164df30884a5192eb869bbe0ea7a7.pdf?index=trueIn PDF document text
    • http://pelatutokutemi.epizy.com/is_xfinity_home_security_available_in_my_area.pdfIn PDF document text
    • http://wisowegu.rf.gd/chernobyl_episode_4_link.pdfIn PDF document text
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_37a383071b5448b8a74d8fbd37dc3c6b.pdf?index=trueIn PDF document text
    • http://silapopo.epizy.com/horde_levelling_guide_wotlk.pdfIn PDF document text
    • http://xovefepotulat.epizy.com/endless_night_lion_king_piano_sheet_music.pdfIn PDF document text
    • http://vivotes.rf.gd/all_bukunmi_oluwasina_songs.pdfIn PDF document text
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_89342e11cb864107a0d13be3c297bc86.pdf?index=trueIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_116e5d1a022e406db3cda8bef8a88848.pdf?index=trueIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_86a0f8f9172044d6b3eb1c58f0d50499.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 2960 bytes
SHA-256: 00c0a141202c10936ceac8b8df9df75720096dbedde9c5fde8d9f3447cbb363c
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 5628 bytes
SHA-256: 866eb119ff497e2846dd516afc39817aaa83c14614d38a4ca1818248477435d6
font_02_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 11684 bytes
SHA-256: 1bae3b6819cd60fca5696fae8c82873b517b75b3fe9d20dcc8c52593b2d25312