Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf1daa6b436e3f7…

MALICIOUS

PDF

71.1 KB Created: 2021-04-02 20:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a3df469f0c6e66ab0ab17ae28e121806 SHA-1: 7b243428e16398b8a40a84ff6e2cff4ca4267d1c SHA-256: faf1daa6b436e3f7d717308a09e24c931eacf322aa994dd200e3bb4f708d1f6d
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to distribute malware or phish users. The document body, though heavily obfuscated, contains keywords related to a 'Stihl ts420 concrete saw price', indicating a lure to entice clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/strik?utm_term=stihl+ts420+concrete+saw+price PDF link annotation
    • https://fofagova.weebly.com/uploads/1/3/4/3/134313529/xibixekurap.pdfIn PDF document text
    • http://lisolu.org/compatible_receivers_for_spektrum_dx5c7t0v4.pdfIn PDF document text
    • http://loxuzemifa.iblogger.org/gaxera.pdfIn PDF document text
    • http://blue-tick-central.com/how_to_fix_melnor_water_timerg44ey.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/gogojekelugowa.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/botegumedasepovinegeparum.pdfIn PDF document text
    • https://pupaxutakigi.weebly.com/uploads/1/3/4/5/134579126/gubupixe.pdfIn PDF document text
    • http://complect-tech.ru/10740068360vtgtt.pdfIn PDF document text
    • http://smcjd.com/left_hand_path_bass_tabng673.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c8f672-e4f1-48e7-a46e-ca59acb05798/dunkin_donuts_stockbridge_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5eaa625-b894-416c-b999-0185b9eb4627/what_makes_you_a_5_percenters.pdfIn PDF document text
    • http://fuzidix.rf.gd/atomic_structure_worksheet_grade_8.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/salary_of_operations_manager_in_dubai.pdfIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/all_muscles_name_of_human_body.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/jimakom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cc7db5f-3764-4a7a-a8aa-9613a1e23c2e/pebble_impulse_watch_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b32131-ab24-4bd7-bae4-7a338c227b4f/tepiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5256cdce-6781-4b24-b303-215f42be0de8/basketball_offense_vs_3-2_zone_defense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd8f524-0eac-478d-9065-c012d779734d/lupegokixuxi.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/stanley_jump_starter_1000_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac3de2d-2135-4edb-a476-f2a0276450b6/judib.pdfIn PDF document text
    • http://ribipusoj.rf.gd/what_are_the_components_of_system_design.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 5576 bytes
SHA-256: b5e4bebec4158ef459975e9a75fc3203ea5cc8e5f355430bf338b0bd4f844017
font_01_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 11020 bytes
SHA-256: c655d36a4e09dfd7cad0a74ec0172d0750c4f936dc0ae9252805571ee153e93e