Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb62f40970fe8976…

MALICIOUS

PDF

90.7 KB Created: 2021-04-18 22:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 35ca7beb7cd054bd419d86638d0e518b SHA-1: 20038033385bee1eb5a144e056e282555188c529 SHA-256: cb62f40970fe89764c0e8e281dde44cad9818a20bfae953902b5c46f3a594736
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to installing network extenders, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=how+to+install+samsung+verizon+network+extender PDF link annotation
    • https://cdn.sqhk.co/manuguwe/jhhcy7r/32615119637.pdfIn PDF document text
    • http://questotzvezd.space/adobe_indesign_newspaper_templates0o4z6.pdfIn PDF document text
    • http://mafebeb.22web.org/gramatica_b_demonstrative_adjectives_and_pronouns_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/ihjcXge/tripp_trapp_newborn_seat_cover.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/jujc0oJ/juwux.pdfIn PDF document text
    • https://cdn.sqhk.co/mutavewituro/dQgdiaM/mathsbox_skills_check_83_answers.pdfIn PDF document text
    • http://wofatis.22web.org/who_is_the_most_evil_character_in_one_piece.pdfIn PDF document text
    • http://masito.space/wedozobelotamadigoh.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/iejjmp0/nisitivuzoz.pdfIn PDF document text
    • http://christmas-gift.ru/pubujiwulod5ny89.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/ZLTpyii/central_air_conditioning_plant.pdfIn PDF document text
    • http://xavubizuj.22web.org/bootloader_for_windows_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e10f2e0-3250-4c4f-bc9f-88e8fd1a9613/how_to_install_fonts_on_cricut_app.pdfIn PDF document text
    • http://tujajolurasa.rf.gd/keguvogozixe.pdfIn PDF document text
    • http://zifelibuvofaz.epizy.com/sumosomodoza.pdfIn PDF document text
    • http://mopituvozu.epizy.com/fire_chess_engine.pdfIn PDF document text
    • http://manatezolixoguz.epizy.com/arduino_midi_library.pdfIn PDF document text
    • http://bakotisimipivok.rf.gd/20624325422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9fb69db-752f-4d01-b1c3-ca9d36980410/nuvogoke.pdfIn PDF document text
    • http://zukowuneze.rf.gd/collecting_data_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001209a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209A 5440 bytes
SHA-256: 80900f7f911cc1ffe0d5892b63541089e24b2373ee91a905c63c19f618310f09
font_01_sfnt_off00013322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13322 11940 bytes
SHA-256: fde62e0b3d8d046bc1d8a1923fdaeeb3056026c443ceadf74b71aa5e2c16192a

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