Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5693d5b02173c3…

MALICIOUS

PDF

98.4 KB Created: 2021-04-04 12:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a56e2b059d9ab4e0c9f6ec543dbea62d SHA-1: d387cb6b08bd599e8e7ee7fad44e6a88c5fea3ef SHA-256: fc5693d5b02173c34c8ce00513cb7fd8fae50a0cce9c7cf5833bca765c59a651
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, directing users to numerous external URLs, one of which is a suspicious domain ('golowaki.ru') that may host phishing or malware content. The presence of many external links suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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://golowaki.ru/award?keyword=brahmastra+advanced+maths+pdf
    • https://cdn.sqhk.co/kupujape/gihjiga/stoney_s_restaurant_menu.pdf
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/9509010.pdf
    • https://cdn.sqhk.co/merabuvi/jaO5ha1/velesigepugepowomalij.pdf
    • https://duxosefexi.weebly.com/uploads/1/3/4/6/134605181/fad30275ed.pdf
    • https://cdn.sqhk.co/renapudovi/n5gdnja/jovozivokapojutufuvifawa.pdf
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/pudojow.pdf
    • https://takixesa.weebly.com/uploads/1/3/4/6/134621412/jajom.pdf
    • http://ruguwafe.scienceontheweb.net/rutefufogutonofabes.pdf
    • https://totidisej.weebly.com/uploads/1/3/5/3/135323484/e9701ae8.pdf
    • http://dezowem.medianewsonline.com/vogazekugolebudumi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_8764ab2631c04bdabaa3c02c643ae7ae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fa1c3fd9-6663-4b31-9ac0-68f605f91f37/how_do_i_mute_my_frigidaire_microwave_ffmv164lsa.pdf
    • https://uploads.strikinglycdn.com/files/b3579dc5-aa14-4ad6-9426-579d99ed80d7/escudos_de_costa_rica_historia.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_a487c88bf7b0452e88ff55fafa753ad4.pdf?index=true
    • https://s3.amazonaws.com/fibesezati/how_to_understand_kinetic_and_potential_energy.pdf
    • https://s3.amazonaws.com/jakujakula/nordictrack_c900i_treadmill_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/7e7a72c7-6c2c-4d33-a7b4-a3a730ea4358/90711229759.pdf
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_8b15b3e3d9d2497b965610c873e73999.pdf?index=true
    • https://s3.amazonaws.com/jamuluvuvava/bible_verse_of_the_day_kjv_proverbs.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f393.bin
3287a66372ce18cc0bf6e15bea9360a7f207301eab27f9f9dadbcdb11bea1b96
pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 5472 bytes
font_01_sfnt_off00010609.bin
d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 3720 bytes
font_02_sfnt_off00011164.bin
3bcd98d3a5eaff040f0fff44fcce2bf0d36ee5f09c10293edeefef7b9bc92b53
pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 2572 bytes
font_03_sfnt_off00011caa.bin
2dbcc07afa24ae327ec10719bc64a67f3c94f7d3829369403fb5c1414350c144
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAA 11364 bytes
font_04_sfnt_off000143a4.bin
bdb498a84294d2700f74802134fcccbe9562d64435b5e6d8d4f3fb931e33cb92
pdf-font-stream PDF embedded font (sfnt) at offset 0x143A4 16144 bytes
font_05_sfnt_off000158db.bin
1a215001b3eabefe6be59b1a09bbe9ed0746cea057ba31990a7984db31c0a9e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x158DB 10280 bytes