Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fb8bcdbb0b6194…

MALICIOUS

PDF

81.2 KB Created: 2021-04-11 03:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5771290f187004fe3f8856b767b2c988 SHA-1: de2eeec8ad0585149fdacc544052b1df7e0410ca SHA-256: f9fb8bcdbb0b6194152af16ed26f959b5cdf66f791a441c2561b0cc86253a95c
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=does+elena+chose+damon+or+stefan PDF link annotation
    • http://pufemebulod.22web.org/45799887979.pdfIn PDF document text
    • http://gozipoxeget.iblogger.org/zavupululixikadamefi.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzutuse/nvcFoih/bapopipojeri.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/agiN0gj/assassin_shooter-_3d_sharp_sniper_shooting_range.pdfIn PDF document text
    • http://nekazebije.iblogger.org/fadapetobazemone.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/ggijjii/79131456150.pdfIn PDF document text
    • http://roxaresasupuke.iblogger.org/neriko.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/australian_english_grammar_book.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/historia_de_la_tabla_periodica_libro.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/total_gym_tv_promo_code.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/flowers_for_algernon_play.pdfIn PDF document text
    • https://cdn.sqhk.co/losopodelim/hijaQhf/82924580264.pdfIn PDF document text
    • http://femuvapazurom.iblogger.org/27525107414.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://fizoluzakazuxaw.rf.gd/bayam_oru_payanam_hd_movie_free.pdfIn PDF document text
    • http://pagumasobud.rf.gd/dizojutivakumos.pdfIn PDF document text
    • https://7dad073a-5858-4d13-bf35-a645d3acb044.filesusr.com/ugd/71e439_fe2bcc45b47b4fd9b0433f1f1c03631d.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_32e344ef0214470d9c963a2d3bf255ac.pdf?index=trueIn PDF document text
    • http://wikukodukoja.onlinewebshop.net/do_blue_dye_tests_always_have_a_faint_line.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_b19fb3a371884396952a2e0bd33b27f5.pdf?index=trueIn PDF document text
    • http://tozopovudot.epizy.com/piece_of_cake_6e.pdfIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_e8931a5148a046d2b6804e707d815a0f.pdf?index=trueIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/homero_poemas.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/the_chrysalids_chapter_14_audio.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_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 5000 bytes
SHA-256: 5cfd347ca42e60817d254ebd6ee5f6929ce25d95d225d76ddbd9fb3a2a81a654
font_01_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 10680 bytes
SHA-256: 67950b0ce66ad7607bbda1257243af42473f7dbddf332780abc7352f193976a2
font_02_sfnt_off0001295a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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