Malicious PDF — malware analysis report

Static analysis result for SHA-256 873ef4ca2cfa17c0…

MALICIOUS

PDF

82.9 KB Created: 2021-03-09 15:17:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 88750155ae1bfb1113fc240b9f6aadc3 SHA-1: 264191e76d4c8b9c408b3af4297b2ea1fbb8ed15 SHA-256: 873ef4ca2cfa17c0221a9c455d436a1c3469d2b7418a90fb8610f35400b64fcc
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'billings method of birth control pdf', aiming to trick users into clicking on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/award?keyword=billings+method+of+birth+control+pdf PDF link annotation
    • http://ericksandoval.com/688790536612khzk.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/36014233701.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/fodmap_food_list_harvard.pdfIn PDF document text
    • http://salebox.shop/29975178718ef6f3.pdfIn PDF document text
    • http://getbuiss.online/840339699965juye.pdfIn PDF document text
    • http://logoped-samara.ru/liverpool_latest_news_today_transfertr4lk.pdfIn PDF document text
    • http://govnososal.xyz/Dutch_audio_tracks_for_moviesb40rd.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/OuHsgia/giduvixulajabub.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/fge4hd0/xbox_grounded_weed_killer_peak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_603debd32e43f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_602607b81b08b.pdfIn PDF document text
    • http://hristogrigorov.com/bavezogibeligu0ut2t.pdfIn PDF document text
    • http://pe50off.pro/dotted_line_reporting_wikioq96h.pdfIn PDF document text
    • http://tb-films.ru/greenwich_honda_express_service_couponsvydxb.pdfIn PDF document text
    • http://fomigiv.mypressonline.com/how_to_track_fat_loss_progress.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/hypertherm_powermax_65_fault_codes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479925/normal_5fdefbfedf8d2.pdfIn PDF document text
    • http://copyright-help-report.com/66243467416noi1g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469849/normal_5fedee9d42c45.pdfIn PDF document text
    • http://auth02mobility.com/51216425810rl0j9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/goxapadukazovebotopaweg.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/26589897614.pdfIn PDF document text
    • http://duwemanuwixam.atwebpages.com/3856049673.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/lysistrata_sarah_ruden.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/hp_prime_graphing_calculator_preo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 5548 bytes
SHA-256: 87f8341989e63cf25252fd5638f395c5514eaca3d4be1e3291c89a76cdaa8110
font_01_sfnt_off0001178b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 11344 bytes
SHA-256: af7bb71bb72eb2c72b00dd2d2ebe022b492b5200af5e1cea3af42961fe423202

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