Malicious PDF — malware analysis report

Static analysis result for SHA-256 81997c40542e95a3…

MALICIOUS

PDF

90.1 KB Created: 2021-03-24 03:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ae2dbd167b5ac9e88c1944e1ed2e85de SHA-1: 7b696e56c1898251a6bc48d5b553830b579f8131 SHA-256: 81997c40542e95a3b4bb8b3d4dbf1919c5cd15eea55cd5bf68561fa22985b0f0
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that redirect to various disposable domains, suggesting a link farm designed to host or distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, indicating the document is part of a network of pages designed for SEO manipulation and potentially malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://baarspo.ru/award?keyword=acute+appendicitis+aguda+pdf PDF link annotation
    • http://lyudi23.ru/how_to_repair_windows_10_boot_from_usber98h.pdfIn PDF document text
    • http://proba7.xyz/ketogenic_diet_food_list_free66sgn.pdfIn PDF document text
    • http://specrazreshenie.com/how_to_set_up_la_crosse_technology_clock954wn.pdfIn PDF document text
    • http://appeal-ig.com/read_the_apocrypha4o0qf.pdfIn PDF document text
    • http://sreda.city/45075296807zm2yq.pdfIn PDF document text
    • http://enots.space/tofalelanalamapuvobaxowquq.pdfIn PDF document text
    • http://fridgeservice.ru/gopulila1wrt7.pdfIn PDF document text
    • https://pogipusuzifu.weebly.com/uploads/1/3/4/8/134869227/93cc52d6df.pdfIn PDF document text
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/werijonir.pdfIn PDF document text
    • https://lerozezowigex.weebly.com/uploads/1/3/0/7/130776164/jaxizabegakip-gerisabajezukej-lufutomoga.pdfIn PDF document text
    • https://mojiwisixireze.weebly.com/uploads/1/3/4/6/134615440/5138283.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/jugas.pdfIn PDF document text
    • http://getsol.xyz/murray_push_mower_bagger_attachmentytemh.pdfIn PDF document text
    • http://zumbayuliya.online/object_oriented_programming_in_java_meaning6two7.pdfIn PDF document text
    • http://cesaregaspari.com/cursos_de_ingles_en_miami_para_adultosamlu8.pdfIn PDF document text
    • http://afracheat4.xyz/a_random_walk_down_wall_street_12th_edition_downloadoyrc5.pdfIn PDF document text
    • http://icub.tech/487460832417scwn.pdfIn PDF document text
    • http://sungo1.space/wopirulie26we.pdfIn PDF document text
    • http://samyog.ru/lover_awakened_read_online6wp6f.pdfIn PDF document text
    • http://varistop.site/netuludilajemegevasesi59eaf.pdfIn PDF document text
    • http://gaydating.world/woxodezijavitgpj2y.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/litunux/actraiser_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/32080068377.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/mozugiveloxugovun.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/nelefofukewo.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/plunge_cut_saw_guide_rail_system.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_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 5184 bytes
SHA-256: a44a48c82fce0b638fe236e4a203d393ea92439709358ed6cb7ee113756c3378
font_01_sfnt_off000135a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A9 11036 bytes
SHA-256: 3b73400b2430badc9ffa9c17bbf07c7f865706e8b7aad132e5d668365f8f121b

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