Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31254410209c2e7…

MALICIOUS

PDF

78.0 KB Created: 2021-03-20 00:29:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dea2bd60bfceec99262657e654565bde SHA-1: 707e1166af1accb74950ede3d0b145e40274e7a2 SHA-256: d31254410209c2e71adc4223832d2ce7a845f3e0d576d09b8e756bd3b56c61d3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or redirecting users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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://vilenefex.ru/wix?keyword=excel+ballistic+calculator
    • http://itclick.pro/xefozolivinifidit5nn.pdf
    • http://gexopidikimo.mygamesonline.org/siwakuwamaxexubar.pdf
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/1379638.pdf
    • http://idealslimitaly-official.site/texas_principles_of_real_estate_1_bookxq4pa.pdf
    • https://makifilibavik.weebly.com/uploads/1/3/5/3/135383918/40726.pdf
    • https://cdn.sqhk.co/tokititagiwe/dYgdZgj/70333781314.pdf
    • https://gutasoleniv.weebly.com/uploads/1/3/4/4/134481560/ziruwiwujige.pdf
    • http://mon-cmbretagne.com/die_fledermaus_overture_piano_sheet_music_free389k7.pdf
    • https://cdn.sqhk.co/temejikowewa/ZF0hhjo/baby_girl_boo_monsters_inc_costume.pdf
    • http://x-bionic.shop/ver_los_juegos_del_hambre_3_castellano_onlinexcyfh.pdf
    • https://cdn.sqhk.co/temazajilib/UhdQAhh/parlour_x_reader_lemon.pdf
    • https://cdn.sqhk.co/xurinuwame/gggd9ge/64594480129.pdf
    • http://srakan.space/takeout_restaurants_open_near_me_right_nowyb306.pdf
    • http://pefiworawodud.mypressonline.com/1089858822.pdf
    • http://goproonly.com/53103481623zngk9.pdf
    • http://shopbest.online/lapetofukemexokegaliwemp0372.pdf
    • https://cdn.sqhk.co/xidujefonari/c6Xhige/planet_fitness_application.pdf
    • http://xiruzox.mygamesonline.org/food_safety_temperature_chart_uk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f2ff8835-bd09-40f6-ba97-0c13fee5e940/i_cant_make_this_up.pdf
    • https://uploads.strikinglycdn.com/files/fe18781d-f0cf-4764-9549-d05d3a317967/how_to_assemble_bowflex_power_pro_xtl.pdf
    • https://uploads.strikinglycdn.com/files/2b534e43-7f33-4227-a241-f30605a01679/34972877249.pdf
    • https://uploads.strikinglycdn.com/files/86b165c1-4925-4454-a739-a7265b156102/gojaguza.pdf
    • http://vakogez.myartsonline.com/wholly_sanctified_a_b_simpson.pdf
    • http://dapizodipe.myartsonline.com/15321072809.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f216.bin
d490ebb73b4f82f5ff47bc2db7e0d9521bb1e0e6d06aa14d1234fe24f4830332		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 4956 bytes
font_01_sfnt_off00010307.bin
8c144b44cd7deb8770ec28d9abb3f8f4cb4a511a4bebf7835ac74ad6544c2b9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 11636 bytes

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