Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b1a201215459c0…

MALICIOUS

PDF

92.6 KB Created: 2021-04-06 06:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f49bf540af739bd8a1801c0d32dd691c SHA-1: e57395e0ef1fc452c380f70899f2138fc3f54458 SHA-256: 05b1a201215459c0bc3bc6e7ee06e71b3bd8ce054e8b0e614204e4fa6f15fab5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on dynamic DNS services or link farms, indicating a likely spam or phishing distribution attempt. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior. While no scripts were directly extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to malicious or unwanted content, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/award?keyword=easy+ukulele+songs+with+chord+diagrams+pdf
    • https://cdn.sqhk.co/tisewesir/iwhjTgg/mexujegiwiselafup.pdf
    • http://lozejebivo.scienceontheweb.net/atharva_veda_in_bengali.pdf
    • https://cdn.sqhk.co/dijabidasu/e3jfhhW/bidademepa.pdf
    • https://karinavoru.weebly.com/uploads/1/3/4/0/134017817/3763925.pdf
    • http://topcreditmonitoring.info/how_to_get_pmi_certificate00tat.pdf
    • https://cdn.sqhk.co/mikedeto/ojfGThb/31027560344.pdf
    • https://cdn.sqhk.co/jomonufo/jbghEjc/22287076105.pdf
    • http://sunakijabe.sportsontheweb.net/dovukeli.pdf
    • https://cdn.sqhk.co/nejibija/0gmjjij/arcade_fire_wake_up_chords.pdf
    • http://numberoone.xyz/bofafun407ta.pdf
    • http://silujokiz.mypressonline.com/jixevubuxofegivu.pdf
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/patidaxubajenozeladi.pdf
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/webajubixixafujide.pdf
    • https://cdn.sqhk.co/munuluxel/c0iaham/50055439623.pdf
    • http://matroskin.space/42590345718rukeb.pdf
    • https://cdn.sqhk.co/ravusigi/sYjeTOz/missile_command_arcade_game_app.pdf
    • http://pasiworuwiwoz.getenjoyment.net/loxup.pdf
    • https://cdn.sqhk.co/kujufemom/hnahfhq/vocabulary_builder_activity_the_constitution.pdf
    • https://cdn.sqhk.co/rawavuzom/jeXifVP/dasewudubun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wisuw/systematic_theology_by_john_frame.pdf
    • https://s3.amazonaws.com/gasodamuza/blackstone_fortress_40k_datasheets.pdf
    • https://s3.amazonaws.com/pujirageg/tivisazuwibojenogepamo.pdf
    • https://s3.amazonaws.com/wazagidonux/auditor_general_report_2017_zambia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011be3.bin
a2c616eb3c3c62fd15304c37170d6ae2ede5ca9a94f17a854b56b128ef601c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE3 5664 bytes
font_01_sfnt_off00012f10.bin
dd34b4e5a2397909c955a7ef5173aa8f44c8af52b646b8462f9efa2f6d48d939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F10 11156 bytes
font_02_sfnt_off00015500.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15500 4324 bytes

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