Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e29337f693b000e…

MALICIOUS

PDF

75.3 KB Created: 2021-04-28 05:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4c1838a1d919ebe65d2cc241d17eb023 SHA-1: b74a9b048fc4c8ed22bd378851dd432ea3c085f3 SHA-256: 9e29337f693b000ef370aa017d4c448b88a3277a348a979a4744b205ca64b6c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, with a significant heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=making+histogram+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412894/normal_600b93fd2dd94.pdfIn PDF document text
    • http://instup.xyz/what_is_the_big_star_in_the_west_tonight0v3su.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_601a86786d79c.pdfIn PDF document text
    • http://akvatehnika74.ru/bosquejos_evangelisticos_para_predicargy0xz.pdfIn PDF document text
    • http://wezutos.iblogger.org/76207655808.pdfIn PDF document text
    • http://popapirim.22web.org/employee_equipment_inventory_list_template.pdfIn PDF document text
    • http://betmoy57.com/sap_display_asset_balances_tcodea78kg.pdfIn PDF document text
    • http://supportcopyright.net/miguwelazufemujepenukav7kixt.pdfIn PDF document text
    • http://azules.ru/is_transcendental_meditation_legit_redditb3til.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5fe7a0cd2c797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_605a6978b9319.pdfIn PDF document text
    • http://cybety.xyz/kerizapivujirdbuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sowabufiki.rf.gd/56936864013.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_065e0fcc8833405fbeac4585b5e78b29.pdf?index=trueIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_ed0f3608c612478aadd17977b704ce85.pdf?index=trueIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_200b44a9daed45cf843fe547ad9f30f2.pdf?index=trueIn PDF document text
    • http://tefinavi.epizy.com/5850615145.pdfIn PDF document text
    • http://patepuxowibano.rf.gd/xawimobuf.pdfIn PDF document text
    • http://xifebudi.epizy.com/anydesk_for_win_xp.pdfIn PDF document text
    • http://pifaramurul.rf.gd/braille_code_cheat_sheet.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_d7e53f6eb5a54b1d8ef77ccbebf31e61.pdf?index=trueIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_013a142a689e4f3fb424d9e75e0c201d.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_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 5228 bytes
SHA-256: 367dc201fbc22fefec7a9a9527eeae456402d20e8935456cdd5efc1178ed8e61
font_01_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 10352 bytes
SHA-256: daccf7a55bfde9ca4aa3d2238b79b21c643ab82bcd1659af7b63605a06082317