Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4e986fff92e93d…

MALICIOUS

PDF

70.4 KB Created: 2021-03-18 19:37:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dff6f087826856f52f8a26d05d1d7896 SHA-1: 7361ef9241c0f47f5c9b6ee442b1018716a67362 SHA-256: 9f4e986fff92e93d5c68d81e19fb4b2d09c682557f6ebf0dc20a7fb222192038
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to contain keywords related to technical books, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crophysi.ru/award?keyword=electronica+teoria+de+circuitos+boylestad+nashelsky+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448331/normal_603d3ae007bfc.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/bhjPhg2/flip_flops_gym_wear.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/andrija_puharich_beyond_telepathy.pdfIn PDF document text
    • http://fezufizibum.mypressonline.com/kisoriroxe.pdfIn PDF document text
    • http://xidufekaposepun.iblogger.org/jokedisabe.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/accord_en_francais.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/dusajafasax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_603bede07dc35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_60184bb6ee80c.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/QifTbGD/16335502478.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/ejdmie9/ninja_games_play_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443810/normal_5ff94249739ba.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/iTQhbia/2469155772.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/YsK4ieZ/fuvetakuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a8a21a-a697-4e4c-9b85-b38ab5c6683e/zukerukemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6239424-6229-47fc-a4e6-98762ec65ebf/find_the_fourier_sine_transform_of_xe-x2_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6c5662-3ade-4ceb-b076-601ea61a5510/21721119959.pdfIn PDF document text
    • http://vovakupalujum.onlinewebshop.net/34494996286.pdfIn PDF document text
    • http://kexomun.myartsonline.com/78710976282.pdfIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/17867528203.pdfIn PDF document text
    • http://lorajazibosiner.epizy.com/54774580687.pdfIn PDF document text
    • http://wipibefab.onlinewebshop.net/visum_fr_deutschland_beantragen_formular.pdfIn PDF document text
    • http://laxizal.epizy.com/astragalus_membranaceus.pdfIn PDF document text
    • http://rozizibuno.epizy.com/catalyst_3750-_e_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cada0a18-0a88-4d5b-8628-89daad753777/when_do_i_get_my_1099_from_social_security.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/garmin_gpsmap_740s_power_cable.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/kuvusovufifatafejovol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/047ddf9a-1eed-4218-a89e-400b9dc5b626/17177935828.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_off0000d515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD515 5508 bytes
SHA-256: a77cd24bdb7ebf9dfe2ead3b9d711e2189f84aef2d3a2dd2d440d80a66e44957
font_01_sfnt_off0000e7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CF 10928 bytes
SHA-256: c4c372e8e509a44c035e8133b1ef7839069cd44f9e187049bc375a5f894a2c43