Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb56e8ca83bfaf6c…

MALICIOUS

PDF

80.4 KB Created: 2021-03-21 02:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1c90e039a705e48867b027424477e7d3 SHA-1: 5b61fc83b52859cce9f5584626341c7116bd0880 SHA-256: bb56e8ca83bfaf6c715b5630020daf79f17085085c2da1edab29ca692c19d038
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/wix?keyword=showbox+apk+download+free+android+2019 PDF link annotation
    • https://cdn.sqhk.co/radofufalam/ubiahhg/elemental_dungeon_mod_apk_money.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/what_is_the_name_of_tokyo_ghoul_season_5.pdfIn PDF document text
    • http://xofitazuregokud.mywebcommunity.org/ordinal_numbers_and_dates_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/jXFppfm/jezutenemapewoja.pdfIn PDF document text
    • http://zosuwalerikare.getenjoyment.net/girufexumoxuw.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/giAia2h/movie_maker_online_video_photo_song_jio_phone.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/topaj.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/dixie_chopper_dealer_login.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/ahhhhwk/vemukudoluwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422148/normal_60076ec316ea7.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/electrical_telemetry_system.pdfIn PDF document text
    • http://melowimaz.getenjoyment.net/advantages_and_disadvantages_of_thermal_energy.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/desercion_escolar_en_mexico_estadisticas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_5fdf8f9f78f71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443292/normal_6047c22a4f982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465690/normal_5fe4189cb0acd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496571/normal_5fd7d5570a690.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/bFjgkjb/66532542591.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rafokusavuti.epizy.com/treasurer_s_report_template.pdfIn PDF document text
    • http://letituxis.epizy.com/gunafijerimuguzobeban.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_b04c4424142d4665b73f65327147840d.pdf?index=trueIn PDF document text
    • http://puvapulugo.onlinewebshop.net/foxowaxiwamejivabizeg.pdfIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_313807f50ad749f0951f23bdb16c6337.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 5900 bytes
SHA-256: ca244b9711fc1f8fbd152c228609629924e61075a42b7e554636339b8324a746
font_01_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 10996 bytes
SHA-256: a6954f317fe15085b77d39afa63a3d184249e01697c952ebdd043a280932ae3a