Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e838416bac0ee15…

MALICIOUS

PDF

80.1 KB Created: 2021-03-24 20:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b6f118880564545078daf594b0d204ab SHA-1: 548ddfe6dd3425efc45d85d84e59937f28a943d9 SHA-256: 3e838416bac0ee159382ed55d20ac5c7f811250f3c83cbc8564018812be871ec
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 0.9950

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/award?keyword=addition+with+regrouping+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/wofetewa/ijjfJib/vizorado.pdfIn PDF document text
    • https://voxonexagigiwal.weebly.com/uploads/1/3/5/3/135346225/lawonapipuno_reminiji.pdfIn PDF document text
    • https://lutowixo.weebly.com/uploads/1/3/4/7/134705225/1103842.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/jPcgjIG/the_game_of_life_vacation_free.pdfIn PDF document text
    • https://fitijozis.weebly.com/uploads/1/3/4/3/134372299/90773.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/poletake.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/cjajfQt/path_through_the_forest_apk.pdfIn PDF document text
    • https://mikuloxituxawe.weebly.com/uploads/1/3/1/4/131410747/rimiwi.pdfIn PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/jimalasaboliloki.pdfIn PDF document text
    • http://gupozatu.22web.org/add_blank_page_to_online_free.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/fight_club_book_ending_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/geradaxezum/djd24ig/somewhere_the_vault_papers.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/how_to_tell_polarity_from_molecular_geometry.pdfIn PDF document text
    • https://cdn.sqhk.co/bowevuva/3Ynhctb/broadband_internet_speed_test_software_free.pdfIn PDF document text
    • http://xezosejosofof.iblogger.org/77332720533.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/noun_phrase_worksheet_with_answers.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/f37462b2-dd1d-43a8-b978-7bec8192012e/universal_audio_apollo_twin_mkii_duo_10x6_thunderbolt_audio_interface.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1c0e4d-f472-404e-a137-babb3b9f5e5c/dusux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d9ae21-e837-45c9-a026-c6bea425422f/how_to_fix_jet_tub_motor.pdfIn PDF document text
    • http://nexogakaxeju.epizy.com/nuwigugoxiwuvijiwarul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c2e447-806a-44e9-a349-579aa22e5825/premium_wordpress_themes_for_blogs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25245118-aab9-4d36-b220-3bbd4671b5ec/whirlpool_duet_washer_error_codes_f02.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07e6709-de81-4d06-974a-e5db283e9901/galaxy_dx_959_cb_tricks.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/email_blockieren_gmail_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/818796c5-14a3-446e-a7c2-4d647066c82b/zodeko.pdfIn PDF document text
    • http://sidakofonol.epizy.com/fowimanazagib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5150de5-e4b8-494a-8847-6f412d1b6a9c/lg_lre3083st_repair_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 5088 bytes
SHA-256: dc1cfa828873fa839837fa06d7758e2db7f789df74c949a5f9258cb6070b0ec3
font_01_sfnt_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 10556 bytes
SHA-256: 1da2090f788adf4d6a1c50520f6f57815e59cde437172cd116d0e60e84b4fe30
font_02_sfnt_off000123fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230