Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cf0f3363188414…

MALICIOUS

PDF

78.5 KB Created: 2021-06-10 19:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d44d93f78714d6ae6f86b9d352b88a0c SHA-1: a8aa583dd57f1974837013d96c18c5b7f68cf608 SHA-256: f8cf0f3363188414d2f6b090d947c01dbb223895d929cfa14c02bb26d63ee050
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous external links to other PDFs hosted on various domains, some of which are disposable. The primary URL observed is 'https://smidgel.ru/pbw?utm_term=barefoot+in+the+park+full+pdf', which suggests a potential phishing or SEO manipulation tactic. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/pbw?utm_term=barefoot+in+the+park+full+pdf PDF link annotation
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/podamimufu.pdfIn PDF document text
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/kozuk_renirebosedame_sonobilutijapup_jolakafewojewu.pdfIn PDF document text
    • https://gutakabumediru.weebly.com/uploads/1/3/4/4/134492877/gukeseluxi_reludunujerip_zefedefamesok_muzikifulafi.pdfIn PDF document text
    • https://wovogivas.weebly.com/uploads/1/3/4/0/134012667/2015275.pdfIn PDF document text
    • https://duwifugikez.weebly.com/uploads/1/3/5/3/135351140/1957578.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://serawazeg.pbworks.com/w/file/fetch/144946971/17651267092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18c1ee2-3018-4c81-8254-a0bcba051cb1/how_does_a_technetium_99m_generator_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45018e4-8096-46d7-a25c-32400b7d93a5/drills_to_improve_shooting_accuracy_in_football.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9170eef4-a689-4a0b-8e89-364e7d8dc786/cuisinart_toaster_oven_broiler_with_convection_tob-60_nfr_tob_60.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144922839/shadaa_movie_download_filmywap.pdfIn PDF document text
    • http://siboxij.pbworks.com/f/gta_san_andreas_cheats_unlock_all_missions_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f17a7b-e1df-4644-9dab-15887dc43a55/46029797017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c48d20-ba77-4762-ac7d-0683d3bbbc72/symposium_plato_book.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/f/factoring_trinomials_worksheet_with_answers_algebra_2.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/chander_pahar_full_movie_hd_watch_online.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/w/file/fetch/144595260/serep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78cab322-e33c-443a-b261-1f1bada100a6/27309980780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b274f4-a9be-41e4-b7f6-ecc9c0c9b04e/simple_math_test_for_job_interview.pdfIn PDF document text
    • http://felinemumivu.pbworks.com/w/file/fetch/145009221/43288871350.pdfIn PDF document text
    • http://dawijunegolo.pbworks.com/f/zunemivofelaxivibusazi.pdfIn PDF document text
    • http://gutopevif.pbworks.com/f/cryptocurrency_day_trading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2be3ce-5629-465c-ae72-f905d5831c77/sony_hdr-sr11_live_streaming.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/f/download_think_and_grow_rich.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 4944 bytes
SHA-256: 81622e0962b2ed92db94c1c3f3869b574a252885304a3c938c083756b410e3cc
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 10752 bytes
SHA-256: eb6f59e3a9f8167fadfc18e18188a6d93e13d10bfd65145d34191ff55339f715
font_02_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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