Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5bef9cd01494e9…

MALICIOUS

PDF

91.6 KB Created: 2021-06-08 11:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 26c512930c7ba6c22e59c776299da43b SHA-1: 2704de2d4a2f51da6298faf9737b3045d0cb654d SHA-256: 8a5bef9cd01494e95c5b41cb34570c95f46d3b27faed7a3dcc85451215628c0e
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 0.9961

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://nomylo.ru/pbw?utm_term=civil+war+surrender+april+9+1865 PDF link annotation
    • https://gipoxafevipetim.weebly.com/uploads/1/3/1/3/131398102/ada9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_6010473082baa.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/0b01fc105c538d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366398/normal_5fef524de68ee.pdfIn PDF document text
    • https://gevobudijopu.weebly.com/uploads/1/3/4/8/134880408/779f36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_60689962c107d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387586/normal_5fe50ca29419d.pdfIn PDF document text
    • https://jipagulus.weebly.com/uploads/1/3/1/3/131379543/xebafanim_zoladiwu.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/5754c8ae-6f60-43ed-b569-867092c48295/how_to_scan_without_ink_canon_mp250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5c5ae4-21b4-4d74-8779-2aea776deac5/mbbs_pharmacology_practical_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e673497-ab6b-43f4-b819-ff46a51e745d/ruvorerowuxefubavuxotop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3b6374-4976-485d-b12e-9c10c9d1d5f7/how_to_get_tlauncher_premium_account_for_free.pdfIn PDF document text
    • http://nosegawibaso.pbworks.com/w/file/fetch/144506727/audi_q5_tdi_performance_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211b9592-c2f5-41cc-9a2b-0aafb412bbc7/jawopakavosivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e9c2df-19c4-4b53-86bb-33458693a0e8/why_is_my_carb_running_rich.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a38a1e-2884-44d6-b27a-f3ed315d65c2/war_of_the_worlds_full_movie_free_online_watch.pdfIn PDF document text
    • http://zewalar.pbworks.com/w/file/fetch/144604998/best_hindi_movie_download_sites_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d66af7-a7eb-44e5-9ae5-5766ce172c4b/69625296900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cd2adb5-8292-4fcb-9e30-8c672901a2b0/89981406110.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144423894/film_my_stupid_boss_2_lk21.pdfIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144736125/types_of_product_positioning_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/695f1407-0f95-4cd4-87e0-a7d33487f590/cuales_son_las_formulas_de_las_escalas_de_temperatura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b40ca85-292b-4ed2-889b-4e41988fd0c8/merchant_of_venice_act_3_scene_4_solved_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb8c253-d68a-4d62-9b7f-01534f4f5cd3/77556173259.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144561387/19445122665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45cbdb4a-b389-459f-84fa-28fb8ac12e20/how_to_refill_ink_cartridge_hp_deskjet_1000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd5eb1b-aa79-4b3e-8bd7-801df1b43d8c/nutribullet_rx_1700_costco.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_off000125c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C5 5692 bytes
SHA-256: 5abb92d06f22e5d9f2dfae993a3417a1f5e8a4a648ae30e9a0afba4eaf49464e
font_01_sfnt_off00013943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13943 10828 bytes
SHA-256: b5ee74ee0643d3273a611aa6933aaca40dd3bfdfdf336538ec80da0be6b87c9e