Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8a4d9b14df9e5a…

MALICIOUS

PDF

96.7 KB Created: 2021-03-18 13:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3a91ef108231bc06070e024043dae552 SHA-1: 5ddb667b35aa0980b9f902367fa3730347160d43 SHA-256: 5f8a4d9b14df9e5abc4a4615702c7a8a333643214b8bdc949bc759ee98295dd8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dafemum.ru/award?keyword=water+pollution+information+in+english+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474989/normal_5ff96aee392bc.pdfIn PDF document text
    • http://numulul.mygamesonline.org/pupomofi.pdfIn PDF document text
    • http://pogadai.xyz/24557723822j3iuz.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/haigElO/frogger_unblocked_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/agfhcia/tennessee_titans_stats_per_game.pdfIn PDF document text
    • http://jewlgems.com/how_do_i_know_when_my_wahl_clippers_are_fully_chargedhxkq6.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/48325133573.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/biology_class_11th_ncert_book.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/bhilger/3_mystery_words_level_9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5fd7bac4b39aa.pdfIn PDF document text
    • http://ozalupa.space/sobikowijosupirabasv7o5i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455876/normal_5ff5f5bb5eed0.pdfIn PDF document text
    • http://on24-system.club/ropilaselijogejeminf29h.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/9568932123.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/bbeb98e6-1187-40a1-8c31-3f824df40436/jeep_hurricane_power_wheels_battery_life.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/21871978007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8670b031-4119-442a-88fc-d9337ff69b81/what_size_is_30_x_45_cm_in_inches.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/bmw_e90_service_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/58922129285.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/echo_user_input_bash.pdfIn PDF document text
    • http://batapijas.myartsonline.com/kisol.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_off00013c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C58 5468 bytes
SHA-256: 2eb9cacdc9c12f8b5892ab7ec040463d26e9d7a749a7e7a7dffec4d1f801245e
font_01_sfnt_off00014ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED8 11380 bytes
SHA-256: 35357d2d35e2cd63df83261cbb850e18d4d1eec5a388b288056a62e4956c1f8e

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