Malicious PDF — malware analysis report

Static analysis result for SHA-256 e272521c6b0b31a5…

MALICIOUS

PDF

110.1 KB Created: 2021-03-18 11:27:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e301878dd7600f7f6ad621a2ad92c81a SHA-1: b01f838732b3502f756e6b749a734a5a9f928762 SHA-256: e272521c6b0b31a519f04b30a6f698cf58f11a910565246c37c554f60fa03768
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=ruqyah+islamic+dua PDF link annotation
    • http://jiludedo.iblogger.org/huduma_number_registration_form.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/ajcTZYv/invasion_of_privacy_legal_definition_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/LjiESQs/32000895981.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/hjhjk7x/tower_color_online.pdfIn PDF document text
    • http://proita.space/v_live_app_on_rokuuxmj4.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/dEDggE2/50072502384.pdfIn PDF document text
    • https://cdn.sqhk.co/xesenames/cifhcge/mobile_wallpaper_manly.pdfIn PDF document text
    • https://cdn.sqhk.co/vusanutoj/KibiiYX/74822262169.pdfIn PDF document text
    • http://sekejibugu.iblogger.org/wall_street_journal_page_a11.pdfIn PDF document text
    • http://kataeta.club/616414207l5lsf.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/LBjbihf/50836911575.pdfIn PDF document text
    • https://cdn.sqhk.co/komilede/gichfgg/wood_deer_head_cutout_hobby_lobby.pdfIn PDF document text
    • http://masito.space/rubajupepud7hwe.pdfIn PDF document text
    • https://cdn.sqhk.co/firokizita/eTCqthe/tixuminirenodirajepe.pdfIn PDF document text
    • http://uscreditmonitoring.info/curse_of_strahd_death_housed96kh.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/iatGZgd/gerber_glass_breaker_knife.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/MZgiaic/uefa_champions_league_results_and_table_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/OWMSEhf/shark_ion_robot_r76.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/ujIgdDy/tegera.pdfIn PDF document text
    • http://urro-hu.com/bizokepivadilonajerw2gsb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zebigibozudival.epizy.com/41257280245.pdfIn PDF document text
    • http://kodekexonalana.epizy.com/alan_walker_ignite_song_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/64440972286.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/gakodatezadexisufu.pdfIn PDF document text
    • http://pawegafed.rf.gd/fotamowabudima.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000176e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x176E4 28760 bytes
SHA-256: 12d9bea2c03900eeebdb4482cc5e8fc8a009e8eb51b2e46d5af79884f1ffbda2
font_00_sfnt_off00013e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0C 5316 bytes
SHA-256: bd666a4285fb236ba054902bb2820cd70866ccc63678539e54e7ff480b23b8e0
font_01_sfnt_off00015006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15006 11600 bytes
SHA-256: 29a6a83a8857d6378ebc9a04a729dc450e6a26fd37c173805223a0e85b6aef3b

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