Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e66e713287c4158…

MALICIOUS

PDF

83.9 KB Created: 2021-03-06 08:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2b53fa52fb7da63ac027315b2be2f59d SHA-1: 24091c67c55bffe3ae34a42bf135b84c3679104e SHA-256: 4e66e713287c4158d42f21b999ff47c45be1df8c78df7ed0df840f6f517efd0e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL pointing to 'jacksth.ru'. The presence of a link farm suggests an attempt to distribute malicious content or redirect users to phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://jacksth.ru/wix?keyword=mcgraw+hill+math+grade+5 PDF link annotation
    • https://cdn.sqhk.co/tivuzofep/3ULFUhe/casino_card_game_app.pdfIn PDF document text
    • http://mexuloxuxinona.iblogger.org/sukikazuwadapepuzomuvoko.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/YjjjazB/7388993775.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/r8hiwgd/radio_rock_89_online_ao_vivo.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/98316364210.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/gclghTO/photo_editor_collage_maker_download_apk.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/bsa_kayaking_merit_badge_pamphlet.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/gToijY7/krabat_film_stream.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_f14ac46f45054fe58da20e41329b41eb.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_1df10ecbf66249139993577c4cd193c2.pdf?index=trueIn PDF document text
    • http://kipazafar.atwebpages.com/tom_clancys_jack_ryan_season_1_episode_5_cast.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_1a008e347a0840a0ba82035089997cf5.pdf?index=trueIn PDF document text
    • http://dajupolix.rf.gd/motorola_sbg6580_firmware_update_download.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/advanced_cardiac_life_support_2018.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_3703a6461872498f9c00c162b11a9811.pdf?index=trueIn PDF document text
    • http://desuzewi.epizy.com/definition_text_structure_meaning.pdfIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_45b47db80256471db13126a0ab901ab1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/trust_in_god_sermon.pdfIn PDF document text
    • http://daxizupalapa.rf.gd/katip_bartleby.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/service_costing_template_excel.pdfIn PDF document text
    • http://litosivofojolid.rf.gd/7918270858.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/free_sap_accounting_software_latest_version.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_a52add10154c49d5a7c3d6dc2cf26d41.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_de77166ed7ec48f7a09c5f6b0f562dbc.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_4516f80073b841fc9a55746dd8e4fcc7.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_cb7ecbd1135040daa5d33723af375ae3.pdf?index=trueIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_16220fbf48624e41b624ab2c1d735261.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 5396 bytes
SHA-256: e2d39a1df54b8f9546b3546fc4cc52dabb616630323fd68618dca16841832bc8
font_01_sfnt_off00011d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 10720 bytes
SHA-256: a76b3d0679f8a5068a2aefd25c736cfc63a1d5d3768bb6d27c77713b306aa913

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