Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abf3e82fde3ea46…

MALICIOUS

PDF

88.0 KB Created: 2021-05-03 11:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 83d820a043a8773be582428a6349f27b SHA-1: 3f22ca351bcce863003231238814d053b783ea37 SHA-256: 4abf3e82fde3ea46026ac83b07768b4faf23a48460917e88566129b9431f1db7
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=shark+navigator+uv440+lift-away+deluxe+upright+vacuum+cleaner+with%252F+extended+reach PDF link annotation
    • http://tadugebakonuged.getenjoyment.net/96763417353.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/ehds0EZ/rivodexukawo.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/ga43Nij/42745941993.pdfIn PDF document text
    • http://muzoc.xyz/966433917251cz7e.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/hhjfjeI/tiny_ideas_large_piggy_bank.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/gcgijid/roblox_boss_battle_mini_games_2.pdfIn PDF document text
    • http://1xbet-football.fun/relation_between_electric_and_magnetic_field_lines1c5zx.pdfIn PDF document text
    • http://drive4mclaneaustell.com/majezatixitodotoniz7s7fx.pdfIn PDF document text
    • http://idealicaitalia-oficial.site/1247138077337xzv.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/gbjcLSN/78952071735.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/hpihidm/mt_carmel_umc_clarksville_tn.pdfIn PDF document text
    • http://lulilafemavivog.mygamesonline.org/67163729456.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/60hayrr/turbo_prepaid_card_daily_atm_withdrawal_limit.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/fidNiaj/fortress_td_mod_apk.pdfIn PDF document text
    • http://lufexaxoxak.mygamesonline.org/sirius_black_wanted_poster.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxogulu.rf.gd/robojage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655ce37d-40f2-48ea-ab06-0e14d40b50f4/club_car_precedent_maintenance_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3343a2b-e251-477a-be66-09f0d24e5d88/hx_stomp_update_2.92.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6332ee-9e03-4c18-b119-7e2e3dba8fc4/cloud_computing_certification_course_fees_in_pune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d699e2d-eecf-47ed-9e6f-6ba87b5e4332/how_to_tone_your_back_with_resistance_bands.pdfIn PDF document text
    • http://votixeju.onlinewebshop.net/slewing_bearing_skf.pdfIn PDF document text
    • http://rerodijipemeged.rf.gd/49191766662.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 6176 bytes
SHA-256: cb4aa69a1a03f01c92ff19459f2f6c5b5f571bc178084079b8b50cdd56b3f3e6
font_01_sfnt_off000113a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 10964 bytes
SHA-256: 7b82767af7ccde572c567485a876a42a72b34ec71a6b5fee9bb6e4918f389c54
font_02_sfnt_off0001393d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393D 16436 bytes
SHA-256: b13270008acaab5467e9798b62e7e9b3f218aae8080d2c367876d2f1835bb24c