Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb7a648c7dd0b0a…

MALICIOUS

PDF

74.9 KB Created: 2021-06-25 15:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a400847190f6e6583d1f40714475b1f SHA-1: dba2f65d3e8844869142fd408b9c2c29b0d58ab2 SHA-256: fdb7a648c7dd0b0a11353e3ceeb035ebfae9bcb983f19bf09bf81d520d404e4c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic to direct users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wb?keyword=kenwood%20ts-430-s%20manual
    • https://kopusitubo.weebly.com/uploads/1/3/4/6/134698796/misuruzeporudatebov.pdf
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/69a0459.pdf
    • https://sepuzemafunud.weebly.com/uploads/1/3/4/5/134584668/pifer.pdf
    • https://xidabasexibure.weebly.com/uploads/1/3/1/6/131637276/34e276ad324cfc7.pdf
    • https://gavivexov.weebly.com/uploads/1/3/4/6/134667590/3102460.pdf
    • https://dikugero.weebly.com/uploads/1/3/4/3/134356342/da020601d.pdf
    • https://zurirepazigotot.weebly.com/uploads/1/3/0/9/130969164/a183d4c687.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b3d0d179-9e2a-491d-82a0-0ca8a3ab1bda/baby_milestones_10-12_months.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60cb3344f702ec1c5cb423ee/1623929669065/kingdom_rush_cheat_apk.pdf
    • https://uploads.strikinglycdn.com/files/ce2d7031-0641-4a0f-870a-f0ee7e45d55c/multiple_regression_analysis_with_categorical_independent_variables_spss.pdf
    • https://uploads.strikinglycdn.com/files/c48f32a0-619a-4bf1-866f-3236952345dc/2005_honda_odyssey_misfire_problems.pdf
    • https://uploads.strikinglycdn.com/files/bb5d3534-8c61-4520-ba3c-43554b5a8995/the_screenwriters_bible_8th_edition.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c4e2b05ffe1d475ea64519/1623515826199/35425548996.pdf
    • https://uploads.strikinglycdn.com/files/6ed5f7b2-6e0e-4d34-913f-236041f029cb/pakistan_studies_book_for_bs_in_english_free_download.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c5151ae997025c16cd26f3/1623528730498/98271431830.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60c987a0cbe47e23de240390/1623820192907/widufofibo.pdf
    • https://uploads.strikinglycdn.com/files/1533128e-5c61-4811-86ac-f9d30497e44e/gimp_tutorial_mac_deutsch.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c3bbf0f85b4b2eac733843/1623440369460/jejowe.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c4e5e42cb46b05b5dad990/1623516645247/symbolism_in_sailing_to_byzantium.pdf
    • https://uploads.strikinglycdn.com/files/50d8c8cb-4e57-4176-b4f0-a105904a148e/super_hot_unblocked_games_66_ez.pdf
    • https://uploads.strikinglycdn.com/files/7ef108d8-bf8b-4f13-8a4d-5ad4b4e421ed/chuck_palahniuk_guts_true.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60cb0607ff68926a1829cd51/1623918088264/68458804669.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e549.bin
5ab0a3bf6400f4d8381987d50b0160ee3ae04729ee539040778fcdbb382a9054		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 5364 bytes
font_01_sfnt_off0000f79e.bin
c561911af43cbf68662d8803e0b0131a3717ec3823616d71673b2445007d3d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 11468 bytes

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