Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a8967d8ffb7af4…

MALICIOUS

PDF

81.8 KB Created: 2021-06-07 17:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4cb0c1ca3f45f4f812208c97399b4edd SHA-1: 447b8d1e714ca488899e387c38dc3246b492721b SHA-256: 09a8967d8ffb7af46d751494f7b27d03650fe65f7ba74c8bbe81009e73f90d79
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 0.9994

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://drafthe.ru/pbw?utm_term=classical+conditioning+theory+of+learning+by+ivan+pavlov+ppt PDF link annotation
    • https://gagafilesiruw.weebly.com/uploads/1/3/4/8/134886729/febexozasuga.pdfIn PDF document text
    • https://nurowilalivep.weebly.com/uploads/1/3/1/3/131380447/64d76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_60119c084dcca.pdfIn PDF document text
    • https://xubegiwemaf.weebly.com/uploads/1/3/5/3/135308842/zininodokuxuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_602b94c40d75b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_6011342c253ed.pdfIn PDF document text
    • https://nimosawi.weebly.com/uploads/1/3/5/9/135982357/3166109.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/d8a999d8-fa7a-4aac-91b3-3fd76c74f45e/basawozibedep.pdfIn PDF document text
    • http://fajopab.pbworks.com/w/file/fetch/144620859/concierto_de_aranjuez_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ec8e14-7f19-4184-9a33-014f33cdeabe/gavizelokovuxonuwowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48937e47-32bc-4cf6-bd6b-327d8c36ed05/43366116669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b326f1f-97d0-43f4-bea5-1881cbc7d4cb/unblocked_games_77_bloons_tower_defense_3.pdfIn PDF document text
    • http://rutarotovez.pbworks.com/w/file/fetch/144647325/how_to_print_with_my_cricut_explore_air_2.pdfIn PDF document text
    • http://ritijix.pbworks.com/f/xuzuvezowugajunasez.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144502398/ds_rom_collection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282ec475-47f7-49b5-8add-7bfd216e35df/where_to_buy_check_registers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b9c08dd-2a41-4d93-bedf-6fdf6dc6bee8/nisaxajujikenifufarikel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/318fe683-deaa-4537-bfb8-d0e5bd81cbd7/bodelujiwirosixav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9282ba05-a2db-45fa-813e-65015a9dd31a/jozogovakerenuzokoregivup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea14eb5-1ae5-40c4-a42e-41875477ab38/best_anatomy_coloring_books_for_nurses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cde0712-e963-4039-a574-24367b00fa46/gapup.pdfIn PDF document text
    • http://goxeguj.pbworks.com/w/file/fetch/144575343/how_to_get_3000_calories_a_day_vegetarian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ae5a77-208a-4808-9920-a3df16117366/whirlpool_gold_series_dishwasher_cleaning.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_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 5624 bytes
SHA-256: 9d335d7f42a0df3814e68274a7aa2b20313116457892e596d7d30fd674d4bd6d
font_01_sfnt_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 11500 bytes
SHA-256: 85c0d7b46d6e93c5978399178547ebc55e6d9f401382c6ce6d40f0ba38810d3a