Malicious PDF — malware analysis report

Static analysis result for SHA-256 163179fbaf028a87…

MALICIOUS

PDF

82.5 KB Created: 2021-03-16 19:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e6d46988bc1560cc66b6044d2d1abf9 SHA-1: d9fae17a0461945474286b51d367543166c5294e SHA-256: 163179fbaf028a873fbe1079e117fbcc7138b91a1c864d34cc489e2696e9d0ee
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier strongly indicated maliciousness, and the presence of external URIs further supports this assessment. The document body, though heavily obfuscated, contains text related to 'Argos catalogue 2020 pdf download', indicating a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://xajibur.ru/award?keyword=argos+catalogue+2020+pdf+download
    • http://sopugepibimel.mypressonline.com/unitypoint_express_care_west_des_moines.pdf
    • http://wajofima.mywebcommunity.org/87591607772.pdf
    • http://naxajogilelog.medianewsonline.com/adventist_church_hymnal.pdf
    • http://mixutadumekaje.mypressonline.com/dekerilekatoburipu.pdf
    • http://pifovabu.getenjoyment.net/lafixenuv.pdf
    • http://zevupixikug.mywebcommunity.org/pizinenapalo.pdf
    • http://pazifelurup.medianewsonline.com/98093938810.pdf
    • http://sevoxotedeki.medianewsonline.com/ashrae_fundamentals_handbook_2009_free.pdf
    • http://duwelizub.mywebcommunity.org/93685533508.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rijonitapadon.myartsonline.com/blank_boat_bill_of_sale.pdf
    • https://uploads.strikinglycdn.com/files/54b85514-4392-4166-8b84-8f9963856d4f/mcgraw-hill_my_math_grade_4_student_edition_volume_2.pdf
    • https://s3.amazonaws.com/kovozenamofox/baldur_s_gate_enhanced_edition_starter_guide.pdf
    • http://vumamuv.myartsonline.com/solo_guitar_playing.pdf
    • https://uploads.strikinglycdn.com/files/497be354-d755-4a42-a2f4-91c112675b42/how_to_deep_clean_crane_humidifier.pdf
    • https://uploads.strikinglycdn.com/files/6d01e6eb-b5de-417f-a7a5-40daa5acbfa3/54575178485.pdf
    • http://ketabigumowun.atwebpages.com/guxinudamekalafami.pdf
    • http://zesafemumibow.myartsonline.com/pen_and_ink_drawing_a_simple_guide_alphonso_dunn.pdf
    • http://jumawivowibeb.onlinewebshop.net/tabla_pulgadas_a_centimetros.pdf
    • https://uploads.strikinglycdn.com/files/ce7276e4-7757-4150-805b-7083328049ad/wefaduri.pdf
    • https://s3.amazonaws.com/bofake/lexezala.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/90107186064.pdf
    • http://kepofif.onlinewebshop.net/life_goes_on_quotes_images.pdf
    • http://mifojizu.myartsonline.com/4186522437.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e738.bin
a62ffc72873b559318c9ff92e6e74a76b288725bdcf6f83b1325e04ea8608774		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 5680 bytes
font_01_sfnt_off0000faba.bin
b623cb60eb66d31abef7a656209652f600437afb1c2ac4cc76bfa92fb22e63e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 13028 bytes
font_02_sfnt_off00012425.bin
37e26a1db41b71425073b1639293d2f7c5336e65e819725204b524c5ab2adfc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 16440 bytes

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