Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b77bbe7122b063…

MALICIOUS

PDF

75.4 KB Created: 2021-03-23 11:31:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6270bb4c84c2313d00b11880de8c51c4 SHA-1: 7118f625e642e582086c247c7f8bb824cf6b832e SHA-256: 86b77bbe7122b063aa784be35fadae50fd0fa78c74fcd0ab564de2b46dc015c8
126 Risk Score

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 0.9952

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=badger+bus+schedule+pdf PDF link annotation
    • http://goldenframecollision.com/free_bearded_man_vector5zivx.pdfIn PDF document text
    • http://namabal.scienceontheweb.net/xofapixukesizidudulatoluz.pdfIn PDF document text
    • http://ru-en.xyz/marojuvezigulukazew9z.pdfIn PDF document text
    • http://medtechnika1.ru/pulepitunelaka7xhl3.pdfIn PDF document text
    • http://nurigoluda.mygamesonline.org/pazudifirosakus.pdfIn PDF document text
    • http://majikok.mygamesonline.org/gipajugek.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/bupelup.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/abstraction_in_art.pdfIn PDF document text
    • http://svarka-aurora.online/5445772398965unw.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/GichfxG/65951003586.pdfIn PDF document text
    • https://cdn.sqhk.co/detatakev/bZNggMI/word_puzzle_games_that_pay_real_money.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/dOT0gg3/panda_cube_smash_how_to_spend_coins.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/EylOihi/adventure_island_nes_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/novupezezis/gCTdXjj/bilesajejigujusilejazapod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wutejaxevewef.myartsonline.com/kewesigijavoxapakuputefu.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/leruluwalefezoze.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/evaluating_algebraic_expressions_word_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/51687449020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2075f7b4-5839-47fc-a9c1-f1b0a946fa5c/lg_mini_split_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bf7e98-fa4f-45ee-91d6-31481c99c444/hp_5520_ink_cartridges_tesco.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/98983764932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e770cc33-eaea-4a9e-b00e-e573a96283b5/wufusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3b5e23-60cc-4f34-b88c-e48083f1b46f/bologaderabejarudexel.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/5386895399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a68cf59-3114-4781-bee6-b37a8888900c/night_owl_4-camera_home_security_system_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/71911297776.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_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 5144 bytes
SHA-256: 24f9de4c3a359c171c19b86d69f4bf591ba485663d41e91478ae4e31f4e184cd
font_01_sfnt_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 10440 bytes
SHA-256: 1cb010341b339574f69e7816e072cf81646ebb05dfe48338f3aa3818c4fc5d55
font_02_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c