Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bc3a70d0912815…

MALICIOUS

PDF

93.3 KB Created: 2021-03-19 00:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 859d4c899ac76b5bd574f41e844c1e31 SHA-1: 1dc81297ed13417b71b9af29939e860878dfd329 SHA-256: 81bc3a70d0912815516b07f27b670e7ba51dd2e285965ff6f9fba001117bef0a
186 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 for a phishing trojan. It contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=the+road+to+wigan+pier+pdf PDF link annotation
    • http://creditchecktotal.info/fremantle_ports_authority_annual_reportpqgys.pdfIn PDF document text
    • https://cdn.sqhk.co/sukonazukuv/8hcDFFl/starting_up_a_small_party_planning_business.pdfIn PDF document text
    • http://clubstore.pro/envelope_address_format_in_wordb5i04.pdfIn PDF document text
    • http://ig-copyrightnotice.com/xepusezigukingnms3.pdfIn PDF document text
    • http://axecheat6.xyz/fimali74g6r.pdfIn PDF document text
    • http://tohld.in/renovation_budget_spreadsheet_nzazkah.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/D6cQygj/dynamons_2_by_kizi_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/Cjfjbig/archery_black_friday_2019_deals.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/be57ZFQ/puzzle_hero_pc_game.pdfIn PDF document text
    • http://nikecortez.net/how_to_use_trane_mini_split_remotedmc5e.pdfIn PDF document text
    • http://arendaavto.taxi/rebogonuvapebulemimop1151l.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/bEazoFd/tournament_schedule_maker_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5eed7070-052c-4612-bd67-e8cf5ed92dca/how_to_clean_braun_shaver_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f8d037-c27f-4a49-859d-519c12e4ad45/what_does_the_bible_say_about_watching_the_news.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f35a09-225c-41c3-bb9f-badc0cebaf81/how_do_you_do_keto_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b516e8-55ab-4585-828d-54066103bcc7/hewlett_packard_officejet_pro_8500a_manual.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_48bfe63e1cff4f309ef001bbfefcb9a5.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_e784bd9ba8224c37905f72e9eebdc353.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_79b2d94f50c34f4a9f88396b07b026da.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_1eb4967a72da4d09a341ba5341247179.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a36a55d-01ea-4edb-9591-43aeedf4411f/howls_moving_castle_fire_demon_name.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_3fd8aa2bc62444df96cd9b1a08eb311e.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_d4ff956cd6a84bfe9a7c232eaf36076e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 4924 bytes
SHA-256: ad4fce5263e67dc2fda62de55d5adc6be4ff0c602eb76beca7eaae972ecaecfe
font_01_sfnt_off000133ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CE 11148 bytes
SHA-256: acbc223717c1314f8deb992e1a01821627ffb92f640e8e2ab4f6a22a5f9b0ca4
font_02_sfnt_off000159bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159BD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.