Malicious PDF — malware analysis report

Static analysis result for SHA-256 581a7fd9b9c811a8…

MALICIOUS

PDF

71.6 KB Created: 2021-04-18 01:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f5c7753c44ea61bccd38f72509b11d2f SHA-1: c1901d319318d89510198406bb60146200b35958 SHA-256: 581a7fd9b9c811a88a73ac235a2fe87d8d8674a59a85f5fe4321ad4427504508
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=heal+yourself+101+markus+rothkranz+pdf PDF link annotation
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/jinijitejowop.pdfIn PDF document text
    • https://cdn.sqhk.co/rujoremebi/Thihd2y/xedowaxutusuzulukumad.pdfIn PDF document text
    • https://zirowebepalijiw.weebly.com/uploads/1/3/3/9/133986526/vapuwozo-josupa-boxaxexoga-xuresikeketo.pdfIn PDF document text
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/sunak.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/hiUhfid/xibofu.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/tavizelobaf-kedolopan-betitigune-ziputonalugog.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/Qsvhcjh/30901330723.pdfIn PDF document text
    • https://maxanijalezo.weebly.com/uploads/1/3/2/3/132303118/e35e51e47f79105.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/dhiBShb/25789891334.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/ihujijb/kitilidizuwafegabi.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/nevizivigar-danapazexetopa-vadabafureboz.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/Cc6Sdgh/pusivubevizebodulevajuror.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/8881588.pdfIn PDF document text
    • https://ferakatetimof.weebly.com/uploads/1/3/4/4/134470639/41419a168417d.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/9jizxhe/cheats_for_charm_king_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/9hfijjc/alone_pics_sad.pdfIn PDF document text
    • https://dunebuka.weebly.com/uploads/1/3/2/6/132682868/2291166.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/g75OD5J/string_around_waist_test.pdfIn PDF document text
    • https://cdn.sqhk.co/vapiwibisa/jhiivhg/paromon.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/7f9591de-6615-44a1-b46b-df102519a945/how_many_calories_are_in_a_taco_bell_crunchwrap.pdfIn PDF document text
    • http://kotowadanoli.epizy.com/movesotowiripunijoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bee4312-0088-491b-8331-522827bafd01/76967024272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6df553e-5d21-4405-895b-cb285862ae5d/measure_of_an_interior_angle_of_a_regular_polygon_with_14_sides.pdfIn PDF document text
    • http://pufufatorum.epizy.com/calculus_ii_book.pdfIn PDF document text
    • http://zefuziboveteg.epizy.com/disoxufiribukawokuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf9c977-27cc-4984-99e9-d374f4189e71/pride_and_prejudice_movie_online_free_1995.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_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 5652 bytes
SHA-256: 4dffdb4f3a311c835184e0d9aa891d4e4d8252e3e5ac50311e3025702b754abe
font_01_sfnt_off0000ea53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 10596 bytes
SHA-256: a5d3cbfc1d5c9fecedb8449f6c21e2268b2e66c6b543f919a632bc5cb1a9d015