Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66644c37a826ce1…

MALICIOUS

PDF

84.1 KB Created: 2021-03-22 13:38:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4f581ef8c491a3d8c63703ccdb23d053 SHA-1: 20cbed542dc5b848551438b7ea4c125d671aeed3 SHA-256: c66644c37a826ce195e007f2947caaf530923f2fac9d22924e71565175bc9498
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://nipisod.ru/aws?utm_term=skyrim+how+to+enhance+enchanting PDF link annotation
    • http://copyrightprivacy.site/tajuxabejifixesabozab8p0v.pdfIn PDF document text
    • http://cethq.xyz/supply_chain_management_schools_in_houston_txebgo6.pdfIn PDF document text
    • http://vivubowi.getenjoyment.net/codices_aztecas.pdfIn PDF document text
    • http://sebevifa.getenjoyment.net/tekisiziko.pdfIn PDF document text
    • http://gatorama.site/tl7eg.pdfIn PDF document text
    • http://sedouche.xyz/bissell_poweredge_pet_filter_cleaningr38nw.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/bafofivuwujikogelepo.pdfIn PDF document text
    • http://buvalopexur.mygamesonline.org/what_is_concentration_in_geography.pdfIn PDF document text
    • http://triple-doska4.club/how_to_add_nvme_drivers_to_windows_7_isov2iee.pdfIn PDF document text
    • http://konolux.medianewsonline.com/tina_fey_bossypants_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e29f0852-aa8c-4fc4-a5db-fcd144ab7086.filesusr.com/ugd/b730be_a1bcecf75c7f4c14978317b2f616ba70.pdf?index=trueIn PDF document text
    • http://tajavuminona.atwebpages.com/calendario_copa_america_2020_horario_colombia.pdfIn PDF document text
    • http://gipuluzew.rf.gd/appcenter_android_proguard.pdfIn PDF document text
    • http://fuzidix.rf.gd/muduvaporew.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/present_perfect_vs_past_simple_worksheet.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_45f9a5a1c2ca4cf5aeb7add9732b5530.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_67b304f1417e41ccbfae0d9181a8abb6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/play_store_app_pc_version.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/chamatkar_film_song_free.pdfIn PDF document text
    • http://vupafigimewex.rf.gd/bleach_brave_soul_mod_terbaru.pdfIn PDF document text
    • http://bavajozobe.epizy.com/upcoming_android_wear_os_watches.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/xobifiberemidu.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/theatre_the_lively_art_10th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/monarch_adtp1_manual.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/51595152989.pdfIn PDF document text
    • http://kavanovadegutok.rf.gd/53464590711.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_f19a32fff12844ab8a0340009d3c2ea6.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_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 4696 bytes
SHA-256: de634a4ba638525d2926cf21601778b81a24a40ab046bec55b6a8cfa7d951075
font_01_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 5364 bytes
SHA-256: cbd93c61500bb60d5f687810ab69c6fb0486690579b284b3f23bfeef949ff22f
font_02_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 11352 bytes
SHA-256: 7bfead566806f88e77134ae5d966d2bb98ae6c682b2bc34f195450fa665f9c84