Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38b15349d3d6849…

MALICIOUS

PDF

82.1 KB Created: 2021-03-27 18:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e076cd82949e3fb05f934998187e2791 SHA-1: 4969b5168966947c0cdb5eb919b23276b9a4b827 SHA-256: c38b15349d3d6849c46e1853396fb4949bb4e4911145bc73469a5fdaea8b113b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The embedded URLs point to various PDF files, likely intended to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://botokaw.ru/award?keyword=enfoque+psicosocial+del+desarrollo+pdf
    • https://cdn.sqhk.co/foropogajag/xWsie9E/flying_bird_drawing_with_colour.pdf
    • https://fofosororu.weebly.com/uploads/1/3/4/6/134642422/8528f69050.pdf
    • https://gidunixodon.weebly.com/uploads/1/3/5/3/135322071/lekapisizumal_wifakuzuvi.pdf
    • https://nirulutot.weebly.com/uploads/1/3/4/7/134700174/2003263.pdf
    • https://torobekaxiwe.weebly.com/uploads/1/3/1/3/131380482/moxet.pdf
    • https://cdn-cms.f-static.net/uploads/4455670/normal_5fd1e891397a0.pdf
    • https://cdn-cms.f-static.net/uploads/4413239/normal_5fe68ff84f2ef.pdf
    • https://cdn.sqhk.co/nebemina/hjhagiV/class_10_english_solutions_first_flight_chapter_1.pdf
    • https://cdn.sqhk.co/pajazidif/4Q5NjPY/city_island_builder_tycoon_apk_mod.pdf
    • https://xofofafe.weebly.com/uploads/1/3/1/4/131438501/274e7.pdf
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/jefadirupezupe_xigojulekowo_kizekerisadob_tinid.pdf
    • https://cdn-cms.f-static.net/uploads/4412591/normal_6010f9641f210.pdf
    • https://cdn.sqhk.co/ragekasa/FiahbS7/yellow_book_audit_training.pdf
    • https://static.s123-cdn-static.com/uploads/4418973/normal_60053a10d19b8.pdf
    • https://cdn-cms.f-static.net/uploads/4495246/normal_5fe706abbf1d4.pdf
    • https://sewetupowak.weebly.com/uploads/1/3/5/9/135971958/rejuxiber.pdf
    • https://cdn.sqhk.co/vekuzajomugi/5ihhcgc/83806237742.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_b4a333076725404dbe2a0ec6ce2d21b6.pdf?index=true
    • https://74bb8966-1fc2-43cb-a641-24c20f380d28.filesusr.com/ugd/84c7b5_eed50a7a5f204a0191c0d613798e4310.pdf?index=true
    • https://uploads.strikinglycdn.com/files/47285b5a-9aac-4932-b749-2affce7adb37/free_magic_tree_house_books_to_read_online.pdf
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_edae84d900e6486ca0a650034ff59beb.pdf?index=true
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_dc7b20a413fc4953a37597f05efb566d.pdf?index=true
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_ac8000c356714ffbb3cee9c0b64d80d5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cc21829c-b371-4f37-89c9-656616447e55/takaki_a_different_mirror_chapter_13_summary.pdf
    • https://uploads.strikinglycdn.com/files/72aa89e7-818c-425e-97fe-0b09df5a5f8e/fantastic_beasts_and_where_to_find_them_2_movie_review.pdf
    • https://uploads.strikinglycdn.com/files/dbc25974-1a7a-49d9-9910-8ffa9159b54f/rizofijifowevasumuxobexa.pdf
    • https://uploads.strikinglycdn.com/files/6cab1863-5a44-43ff-a92f-22a74b75f63e/how_to_clean_a_carburetor_on_a_tecumseh_engine.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_off000100ff.bin
409555e8b5243f33f614df4dcf3b02a256ea44b23d10f27c794890c1838c84fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 5232 bytes
font_01_sfnt_off000112e0.bin
cf7334d76f4720d68a90be7b672425894d90a6cf131db527df5afeac02f9ac15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 11676 bytes

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