Malicious PDF — malware analysis report

Static analysis result for SHA-256 c081612e76f564a9…

MALICIOUS

PDF

78.7 KB Created: 2021-03-19 10:01:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 42a8131b2c229fa65b3daad76fb5f59c SHA-1: 90ffe6b9ca30df9b9a9552cb59bb3c8cb6307446 SHA-256: c081612e76f564a94171ef75bbfa0db23bfb6c160773536a1732c4a0a30dc0f5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://nipisod.ru/award?keyword=ableword+free+pdf+editor+download PDF link annotation
    • https://cdn.sqhk.co/novoganug/zib0haX/zatosuluvomatelopatupapul.pdfIn PDF document text
    • http://pezisafepogux.22web.org/1877385735.pdfIn PDF document text
    • http://kleomaften.online/nexumemesibaletitbq49.pdfIn PDF document text
    • https://cdn.sqhk.co/givinonu/FggAZJm/labyrinthine_fistula_vs_perilymph_fistula.pdfIn PDF document text
    • https://cdn.sqhk.co/lazimafuxuxi/Hhahdpw/uefa_champions_league_2019-_20_standings.pdfIn PDF document text
    • http://situvupumu.medianewsonline.com/bilinguality_and_bilingualism_hamers_and_blanc.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/gogudax.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/S0BgT2N/rainbow_ball_adventures.pdfIn PDF document text
    • http://blekrossi.ru/how_to_fix_tumble_dryer_not_spinningzesys.pdfIn PDF document text
    • http://about-igsupport.com/4631027692u6ak1.pdfIn PDF document text
    • http://gunofixe.medianewsonline.com/dapebekiwanepowiluwu.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/51852948389.pdfIn PDF document text
    • https://cdn.sqhk.co/budotedo/8ojcfjf/fake_call_log_screenshot.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/be920410-21ea-4aca-a30b-b6822e7eefcc/how_to_manage_stress_and_work_life_balance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/314c9303-e17d-4d6a-b524-bc97c6004b1e/50372335155.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_06cf0847dc1446848e5af57b5ca9312d.pdf?index=trueIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_2b8f0ec538fb460795eef77311165d79.pdf?index=trueIn PDF document text
    • http://fisuzes.epizy.com/honda_harmony_1011_grass_catcher_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59eaba77-26c1-4b49-9c72-6d63c48d3310/new_testament_greek_english_interlinear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90296f30-0c12-4e67-aab2-fc8ec93b23c1/kung_fury_netflix_removed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26bb5b5-d9f4-44c3-962a-d7404fd6de26/irrevocable_letter_of_credit_vs_bank_guarantee.pdfIn PDF document text
    • http://diwedixeku.rf.gd/80_diy_king_size_platform_bed_frame.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_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 5080 bytes
SHA-256: 1bfa98160fbc5a4b873c54b648f24cce616173d49f673ff00b4c1bf61841d08a
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 10896 bytes
SHA-256: 4365ed2364d1f59465adef9d1208e2619b5591823b66771295347099b4b849fc