Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d9b1981b6967e8…

MALICIOUS

PDF

69.3 KB Created: 2021-04-02 12:39:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8c91f9ff6e0a1cef216f4063c6238148 SHA-1: 0e4d07535328da76196f61a24c2dd39a565c0ba0 SHA-256: 46d9b1981b6967e8526c33d610071170fdc56e135e7eba10e7b784d39068a4bc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the PDF structure point towards an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/123?utm_term=react+native+change+splash+screen+android PDF link annotation
    • https://cdn.sqhk.co/mixaluwekitu/1hbgcTZ/youguides_get_views_likes_subscribed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415321/normal_60146f2ce22d3.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/jbjcrjc/guess_the_song_lyric_quiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_60652f39f3994.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/honda_eu2200ita_2200-watt_inverter_gasoline_portable_generator.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/academic_writing_from_paragraph_to_essay_download.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/hehehEt/35350111034.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445118/normal_5ff0c1ad5f044.pdfIn PDF document text
    • https://cdn.sqhk.co/kotoweraga/Pghmihm/kajagumekesexati.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/ghvjbjd/xorobesisalaw.pdfIn PDF document text
    • http://mivifukatovaga.getenjoyment.net/23693631104.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/73121a3b-ec62-4fff-870c-32ebfc28f7ce/55670987542.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_57162a78351f4b21973b86f3ba2f247d.pdf?index=trueIn PDF document text
    • https://0ddd2631-58c7-464c-86d0-a5d1d8121c04.filesusr.com/ugd/301b85_bda1970fc9d7452c987aee5a789797d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27304930-d739-47c4-a9bf-07396d3a0539/intermediate_microeconomics_with_calculus_9th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf736af6-b624-4833-8362-a996a27d40bb/gakesiwum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bac4d03-bac7-4d0c-bab3-3a4069722eb5/59692533948.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_403d9d1a8430469f98c9c4438aace10f.pdf?index=trueIn PDF document text
    • http://noroved.myartsonline.com/hexblade_warlock_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9165a49d-cf21-4b40-81ec-e671d1b28df7/limotipiganabotaxuvife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc553ec-9089-490c-aed2-c8a4c2662596/how_to_break_a_curse_through_prayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d86e42-562f-4213-b473-d1e1880c742a/how_to_show_the_value_instead_of_formula_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f763b00-92c7-4069-b743-241a98944560/77117772631.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A1 5404 bytes
SHA-256: 16fb92ea9a03fe03656928a307d99e13f6475b731a6a9f2d545307260933348c
font_01_sfnt_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 2100 bytes
SHA-256: 823b9bfd5ffb85ec35788331e1793513ee74e97917d755e42863bd1bf76cf231
font_02_sfnt_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 10676 bytes
SHA-256: 8b335e663b60a320c211b22c675b6e1c28bc3a9f9a624b8971efaead8cc0c477

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