Malicious PDF — malware analysis report

Static analysis result for SHA-256 77561f7e357db395…

MALICIOUS

PDF

81.8 KB Created: 2021-05-13 05:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b2b4629ece95f62d8a97a3613c4336cd SHA-1: 2a97c24bad6fa893112e8fa725c94280a3f01c34 SHA-256: 77561f7e357db395f65c6c1235ea444f46df60c86bafafd741750d1f67fdc179
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the malicious intent of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/strik?utm_term=principles+of+design+rhythm+examples PDF link annotation
    • http://bivadula.22web.org/simple_home_budget_template.pdfIn PDF document text
    • http://vienvozvrat.site/daycare_assistance_ny_income_guidelines7276d.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/YgcyYgg/jupulemanufob.pdfIn PDF document text
    • http://alcozerox.com/voyager_legend_cs_bluetooth_headset_system4evh8.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/eo5Gihb/gestion_comptable_d_une_entreprise_individuelle.pdfIn PDF document text
    • http://funogager.22web.org/are_inversion_tables_good_for_scoliosis.pdfIn PDF document text
    • http://wekeb.space/how_to_improve_grip_strength_for_rock_climbinghq7rn.pdfIn PDF document text
    • https://cdn.sqhk.co/ganidabizi/jczjgeO/canadian_visa_tourist_application_form.pdfIn PDF document text
    • http://legendbilisim.com/icse_biology_class_9_booky42gr.pdfIn PDF document text
    • https://cdn.sqhk.co/bejamisokepu/jgwihuU/cars_for_sale_craigslist_by_owner.pdfIn PDF document text
    • http://bestrongbyg.com/vafodoxudenitiperueyk3i.pdfIn PDF document text
    • http://xubesepa.22web.org/88723227508.pdfIn PDF document text
    • https://cdn.sqhk.co/julukimesof/AWO4ibs/26190639090.pdfIn PDF document text
    • https://cdn.sqhk.co/sijiposago/eFwgiih/cooking_food_restaurant_tycoon_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/ib8Wger/minimalist_tumblr_themes_single_column.pdfIn PDF document text
    • http://taxobadukiwad.22web.org/bwv_1007_guitar_tab.pdfIn PDF document text
    • http://xteenware.online/telegram_x_apk_pctic5i.pdfIn PDF document text
    • http://small-italy.space/fikewtfda8.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/geihicc/12594823903.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://dorofudi.epizy.com/busugiwonok.pdfIn PDF document text
    • http://xodupope.epizy.com/alone_picture_hd_free.pdfIn PDF document text
    • http://putojoner.rf.gd/building_drawing_n2_textbook.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_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 5528 bytes
SHA-256: 8fef98c28c248b5065c6594c1686c20ad6656537fb49e3f43c145514b2397db6
font_01_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 11340 bytes
SHA-256: b14101af931af152fe9049933d861d3b697a776e3779527eab55b02e6397efbe
font_02_sfnt_off00012a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A13 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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