Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dc1978de97beda…

MALICIOUS

PDF

78.6 KB Created: 2021-03-15 21:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7e335e66e20673e8e0ed78c50760825 SHA-1: 90a847f5ab1fd73c3bdeeef5d7d5c0ffd53c06f0 SHA-256: 18dc1978de97beda002bf04e514ac563670325934247c55a422c02a1f6758102
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a "buyers guide". No scripts were extracted, but the PDF structure itself facilitated the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/award?keyword=buyers+guide+pdf+fillable
    • https://cdn.sqhk.co/ribobujir/ixieUlh/ivar_viking_raiders_wife.pdf
    • http://gaximivotekole.mypressonline.com/ao_smith_water_softener_reset_button.pdf
    • https://cdn.sqhk.co/poronujefino/igfhhS6/vortex_cloud_gaming_mod_apk_revdl.pdf
    • https://cdn.sqhk.co/rilabotib/bridjcZ/azalai_defender_130_camper.pdf
    • http://tigefezatolipeb.iblogger.org/63190674460.pdf
    • http://sijuvibitita.iblogger.org/blank_ingoing_condition_report.pdf
    • http://nivulegojin.iblogger.org/what_do_large_spiders_mean_in_dreams.pdf
    • https://cdn.sqhk.co/bitowiso/fBfLWuv/football_legends_roblox.pdf
    • https://cdn.sqhk.co/xevowuto/dqiehhv/diy_christmas_costume_ideas_for_adults.pdf
    • http://gadivawiw.sportsontheweb.net/kopajuxagorigizeka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/divelatoxa/schwinn_15_function_wireless_bike_computer_instructions.pdf
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_bbe1c2624bf34cf5ae0cfdd6770b8253.pdf?index=true
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_018e577ad63d4a78809f2ab59c34878b.pdf?index=true
    • http://nogigekeweragu.rf.gd/sotibirojezunojemu.pdf
    • https://s3.amazonaws.com/tunenijexe/sasigowuxefajimazuzoza.pdf
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_1543c6df2b594bde88594c5519ab32d7.pdf?index=true
    • https://s3.amazonaws.com/sejakopa/noticias_sobre_problemas_ambientales_en_mexico_2020.pdf
    • http://xopibakexozar.epizy.com/vukuzekubizokojowemewuka.pdf
    • http://zesivigodexewig.epizy.com/58544454373.pdf
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_a4104791fab248929bdb1effb981cafd.pdf?index=true
    • http://nedajazamofo.epizy.com/angry_birds_star_wars_ii_game.pdf
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_d1db1c12cdfc4057a7cc70b574455bb8.pdf?index=true
    • https://s3.amazonaws.com/xurixado/29226249498.pdf
    • http://weponigonimogo.myartsonline.com/cholesterol_diet_meal_plan.pdf
    • https://s3.amazonaws.com/pipaneku/12718766968.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_off0000f705.bin
ce24442bd327f707b91cab84e6a1c107c6fea64513ca8f60148c0f1204ea0bfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 5500 bytes
font_01_sfnt_off000109ca.bin
e5af88e31368ae8cf1c3c583773e24f86fe6b24157e3c6bc5a5c2901eac3bbe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 10404 bytes

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