Malicious PDF — malware analysis report

Static analysis result for SHA-256 3daba7e58e1bf4b3…

MALICIOUS

PDF

76.1 KB Created: 2021-03-28 21:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 71849f4d9446664f4dd0715d165796bd SHA-1: 7c65e261fefd0f2a5ba9e6be02d1ee3da0a59cc7 SHA-256: 3daba7e58e1bf4b36b64d422d36ea8728e265f048e0dbe35c867e2ca17a994ee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a specific ML classifier and ClamAV detection for phishing and trojan activity. The document contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of external URIs and the overall structure indicate a phishing or content distribution attempt.

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://nipisod.ru/wix?keyword=stringed+instruments+word+whizzle+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5fcfa01a5e188.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421778/normal_5ff869e26f843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_6031f02de2b92.pdfIn PDF document text
    • http://kixubobumetorab.iblogger.org/backpackers_guide_to_da_nang.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482636/normal_5fec2fb80dd06.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/BAnjeMn/slide_away_miley_cyrus_vma.pdfIn PDF document text
    • http://rumulive.iblogger.org/lufijosugozoforenisedaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_605f87cff1512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_604e1cecadf86.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/WjbgdPH/vuzovivezafiwobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_603579c64168f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474471/normal_603776a662f19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zegemipufe.epizy.com/which_software_is_good_for_c_programming.pdfIn PDF document text
    • http://xumolax.rf.gd/mawozivapeki.pdfIn PDF document text
    • http://nawevoted.epizy.com/69994120985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0fed2b5-ba34-4c2c-aeb2-fe0d6cf9ecfc/john_carlton_allstate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf0f478-e2a9-4165-acf0-fb46f75cd857/68154592829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d12e09-94a4-45c4-aae0-204e4144f47c/samsung_galaxy_note_8_screen_replacement_price_uk.pdfIn PDF document text
    • http://gulavutimomoxu.rf.gd/wahl_arco_se_limited_edition_cordless_clippers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6851eb9-add9-4570-a96e-4870d93a3aa1/what_is_place_value_in_math_1st_grade.pdfIn PDF document text
    • http://rikabaxonis.rf.gd/how_do_you_change_the_filter_on_a_whirlpool_refrigerator.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_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 5484 bytes
SHA-256: 99e43ad8532eaa86a7697f770ade46d987b975486835ab2ea8003cdcb6da1079
font_01_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 10712 bytes
SHA-256: 83613fc4e190e4925c9dd246e54c4e7fbdfab813d51f3c25f864e03756898625

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