Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d51851f4eaeb3ff…

MALICIOUS

PDF

79.6 KB Created: 2021-04-01 11:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 894400cca3bbc241716aeb6016a802b3 SHA-1: d22036b5b3902de14b296aa0cc583f62394e8065 SHA-256: 7d51851f4eaeb3ffe02d3def200324889ce8832e2c1eec4d0197ec091cf23299
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with at least two pointing to disposable hosting and potentially serving as part of a link farm. The document body, though heavily obfuscated, suggests a lure related to 'geophysical survey' to entice users to click on these external links, which are likely intended to deliver phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/award?keyword=geophysical+survey+in+archaeological+field+evaluation+pdf PDF link annotation
    • http://basujenos.22web.org/71713069264.pdfIn PDF document text
    • http://nazapakag.22web.org/nibedidoxulova.pdfIn PDF document text
    • http://wilitubejibo.iblogger.org/34536338820.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/bXejbCI/my_virtual_pet.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/nijifBn/88005555227.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/egcUv2R/gacha_club_download_ios_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/wojinagimepu/p5bhijh/uc_browser_pc_free_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/dejenuluzew/RXZM8MK/xaramubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ropasibemufi.epizy.com/basho_poems.pdfIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_d7e142e2817a4a3a9478a5cb38d5d641.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd51612-8f65-4a4d-a589-49cbd934d5db/volume_of_a_cylinder_worksheets_with_answers.pdfIn PDF document text
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_c221908b73dd421b87e121ea4ffe0b9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/349398cd-b4fe-47a7-b10b-ce2203190dbc/vebifavabujaped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfbb0333-27ee-4f59-bb35-8896985d0a83/what_questions_to_ask_in_a_vet_school_interview.pdfIn PDF document text
    • http://girigiroret.rf.gd/46969257546.pdfIn PDF document text
    • https://5e04165b-6ab1-49a6-9937-45006fc2fbeb.filesusr.com/ugd/d19879_32b4c64d4d2c457b9a42e541024940ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6d8796-944e-480c-a8fe-8ac16c5e3808/mercruiser_3.0_tks_repair_manual.pdfIn PDF document text
    • http://menutewewunidov.rf.gd/low_carb_diet_ketosis_metformin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ffa3a5-c1fe-4f73-a4d3-a755217ee052/30782542108.pdfIn PDF document text
    • http://wasuvanibup.epizy.com/f_ratio_table.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_8f27db276d83430b9410883476ec726e.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_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 5612 bytes
SHA-256: ad65adc08d9f504cc41b2f1c2fb29b8b2446de8a4089dce27987c8c8dd9e0e4c
font_01_sfnt_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 11076 bytes
SHA-256: 2209cae7244c389859dfcfa0edc17d3280f691dc91f1bdc8f50be7046d60db7f

Open this report in the interactive analyzer, or submit your own file for analysis.