Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e90d6526e6da465…

MALICIOUS

PDF

76.4 KB Created: 2021-03-08 18:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a091cbac0155d451dfdd3705d739e1cd SHA-1: ba4c1738c23a5e49987f4aafbe34579780dca492 SHA-256: 9e90d6526e6da4653923a0f35a6f264276a9d1913f2f98128c69c36e005bf50f
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to distribute links across many low-reputation domains. No scripts were extracted, but the presence of external links implies a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/award?keyword=bi+weekly+budget+planner+pdf PDF link annotation
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/3845235.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/RhbSJR9/mumejemanoviwanupubasuxi.pdfIn PDF document text
    • http://aydym.club/969291423446pe2k.pdfIn PDF document text
    • http://mebel-albero.ru/wixakasanarusemixufawifong0cv.pdfIn PDF document text
    • http://malespw.xyz/how_much_do_ideal_boilers_costs84qt.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/apowersoft_online_editor_review.pdfIn PDF document text
    • http://nimojojisox.22web.org/dewedipe.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/hd3ghjg/95392250117.pdfIn PDF document text
    • https://zibezalobe.weebly.com/uploads/1/3/4/5/134529300/pozoxesuban-remepi-wakeno-xebagosopejo.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/computer_basic_course_online_test.pdfIn PDF document text
    • http://leomannapov.com/timex_ladies_watches_prices_in_pakistaneir1o.pdfIn PDF document text
    • http://gradstroy.su/jim_wendler_531_excelnk4dx.pdfIn PDF document text
    • http://krokoboko6.xyz/galaxy_on_fire_2_hd_all_shipszkzyl.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/five_nights_at_anime_game_android_downloadwj5fr.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/sisurapuxarame.pdfIn PDF document text
    • https://belukuxar.weebly.com/uploads/1/3/5/3/135312366/ferolonewunu.pdfIn PDF document text
    • http://mujododaziwato.scienceontheweb.net/moxumov.pdfIn PDF document text
    • http://storeyou.store/agro_ecological_zones_of_malawie5kie.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/eZjfghQ/offline_free_fire_game_download_for_pc.pdfIn PDF document text
    • http://fringigejy.site/79151774110hggfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fereralud.epizy.com/3202549623.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_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 5476 bytes
SHA-256: 413285018f74a01a8d2339c9661da52a1466286f307422f950e7cc50a40a7d4e
font_01_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 10344 bytes
SHA-256: b94bc93bbb9623a529dd3174aa316a63628efd705a106539b936113cc59de523

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