Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bff27b24097d1e…

MALICIOUS

PDF

78.7 KB Created: 2021-03-25 21:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24d544504a73736cdad77dc02b9e9af2 SHA-1: 8ade7e5cd3eabd3fa865f5081327cd92094b849a SHA-256: f0bff27b24097d1e7fb11a2bf34662bec09d04dd98bf84a42085f3e8016aaebd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, appears to contain metadata related to a book report, serving as a lure.

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://jumiwimov.ru/123?utm_term=the+candy+shop+war+book+report
    • https://wedidosav.weebly.com/uploads/1/3/1/6/131637371/wejanozotefanode.pdf
    • https://gipenozup.weebly.com/uploads/1/3/1/0/131070487/gozosugezerazuj.pdf
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/tuxomorexidebomewowi.pdf
    • https://bijafifevidajun.weebly.com/uploads/1/3/6/0/136051066/0596e2.pdf
    • https://mesukaxepa.weebly.com/uploads/1/3/4/7/134728578/5086421.pdf
    • https://cdn.sqhk.co/kosojevevoxo/ggianhi/tangled_song_i_see_the_light_karaoke.pdf
    • https://cdn.sqhk.co/vutowogipu/5srK6ih/3929372759.pdf
    • https://motubisirewu.weebly.com/uploads/1/3/4/5/134529252/2885914.pdf
    • https://cdn.sqhk.co/kefivaxepaj/dhignih/blue_robot_cartoon_network.pdf
    • https://cdn.sqhk.co/pabilere/PhchdAh/mewing_definition_jaw.pdf
    • https://nazorilorapumug.weebly.com/uploads/1/3/0/7/130776423/jivolulaso_temiz.pdf
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/3f8445.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_b2b870aeb2464413afc9a4dae37a559a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e36f38bc-8aff-444f-99d8-ae56894156ad/biwolex.pdf
    • https://uploads.strikinglycdn.com/files/827918af-ed25-4da3-8a47-2abec5863c6a/can_i_import_journal_entries_from_excel_to_quickbooks_online.pdf
    • https://uploads.strikinglycdn.com/files/da782a63-0de2-4d01-8f5b-7dab9daaa0cc/xudipejit.pdf
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_39df5dc3d457482e8f0a07045579b23b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d34a1c7b-d376-4fce-b2a8-f1748c771dd4/10484721456.pdf
    • https://uploads.strikinglycdn.com/files/9f7accd0-0061-44b1-a8a4-c594dd54185d/zosilinavetefeb.pdf
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_26a5f0bcedae490f93fe87fae7a05986.pdf?index=true
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_f274b3b2ab2845439aa08199c327510d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ede93683-a871-46f3-a1da-5001eca172ce/all_souls_day_2020_tucson_az.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_off0000f3ad.bin
dbe52bed82f8d527cb716a3bf111717d81c28f220909a20f1fed0944b4c1c627		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 5476 bytes
font_01_sfnt_off00010659.bin
1c346140cd7573373d485ea958c9a57a2708dbff41ff8887aa1bdcfa5283ea2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 11616 bytes

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