Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99fa268633ea101…

MALICIOUS

PDF

78.8 KB Created: 2021-04-04 02:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7ded62b80ae17f11c3f4c86d5e619dfc SHA-1: 3092c9cb45ddcb1e0b4e3c34b932ac1418e61102 SHA-256: d99fa268633ea1010593d8f664f20226b673c4d7eb5be1648813a38922e2191f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting, pointing to a potential phishing or malware distribution scheme. The primary malicious URL identified is https://seumenha.ru/strik.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=crane+frog+humidifier+not+misting PDF link annotation
    • http://nomenowunesazoz.scienceontheweb.net/88228533669.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/jcjbhhT/super_bomberman_online_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/ie0ific/pocketinveditor_pro_apk_2018.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/the_righteous_mind_download.pdfIn PDF document text
    • http://wevesapawuzu.22web.org/kumon_worksheets_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lunosupi/ggwjhNg/solid_color_wallpaper_iphone_11.pdfIn PDF document text
    • https://giduwuxudi.weebly.com/uploads/1/3/4/7/134716719/gifulov_lofimij_pebuvew_josalekebo.pdfIn PDF document text
    • http://xuroriwonufuz.scienceontheweb.net/myers_ap_psychology_test_bank.pdfIn PDF document text
    • https://xikunozazoteta.weebly.com/uploads/1/3/1/4/131453294/2612097.pdfIn PDF document text
    • https://cdn.sqhk.co/wafudovop/fjhdhiO/archery_animal_hunting_3d_game_download.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
    • https://s3.amazonaws.com/bevekizadoxuj/mupibobidofi.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/latex_poster_template_portrait.pdfIn PDF document text
    • http://nawevepumag.rf.gd/magoviwolivofudanabofed.pdfIn PDF document text
    • http://tozuduxaxikagik.rf.gd/android_games_apps_apk.pdfIn PDF document text
    • http://patudesaruvob.atwebpages.com/anatomy_and_physiology_of_the_eyelid.pdfIn PDF document text
    • http://joruvone.epizy.com/antigona_cela_lektira.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/zanodidofovirirituki.pdfIn PDF document text
    • http://dasowarixolusix.rf.gd/wuxidotekojesoja.pdfIn PDF document text
    • http://xutuvom.rf.gd/guide_to_integrated_accessibility_standards_regulation.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/how_to_delete_rosetta_stone_account_on_iphone.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_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 5192 bytes
SHA-256: 3cb8a378b7ce8300a19604f2ca216bf3766d2e6c112f01d9fca223f510328a1e
font_01_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 10180 bytes
SHA-256: 5998ccc3d5e7f43ff418538ed9925515e0fe7e0f5ccb0934a8dc9e25793e9fdf
font_02_sfnt_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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