Malicious PDF — malware analysis report

Static analysis result for SHA-256 1791436840124dc8…

MALICIOUS

PDF

90.9 KB Created: 2021-02-21 22:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ab015533802d0e116714b00ff9e86da5 SHA-1: b9513aad1d51f785c510d24bdce6fa1f19f6d28c SHA-256: 1791436840124dc8e71eedb9c2c57218c5d6ffaf63179115c02551803963393f
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The primary URL, 'https://maypoin.ru/123?utm_term=what+are+the+benefits+of+co+teaching', suggests a phishing lure disguised as a search result. No scripts were extracted, but the overall structure and URL distribution indicate a phishing campaign.

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://maypoin.ru/123?utm_term=what+are+the+benefits+of+co+teaching PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412899/normal_602dece081bfb.pdfIn PDF document text
    • http://kibukulatari.22web.org/tusobafok.pdfIn PDF document text
    • https://jokuduzasaru.weebly.com/uploads/1/3/1/3/131381103/2532298.pdfIn PDF document text
    • https://fifikasato.weebly.com/uploads/1/3/1/4/131437502/dec7b5ca84.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Ovlrkhd/equalizer_program_for_windows_8.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/zijobi-merawijamubaj.pdfIn PDF document text
    • https://xezagepu.weebly.com/uploads/1/3/4/9/134901129/2308692.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/hazXlgd/tofevixe.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/gfic3ha/zombie_waves_3d_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sifezob.epizy.com/pakepofowafafolaros.pdfIn PDF document text
    • http://pomolado.epizy.com/pandoc_templates_location_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/shiraz_wine_nutritional_information.pdfIn PDF document text
    • http://laguzovola.rf.gd/oppenheim_and_schafer_discrete-time_signal_processing_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/kirby_super_star_ultra_sheet_music.pdfIn PDF document text
    • http://kimufigekufeta.rf.gd/baik_punya_cilok_full_movie.pdfIn PDF document text
    • http://gifimedirawi.epizy.com/nivudojiwilu.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_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 5264 bytes
SHA-256: 591516d596a46caa4046e499732eefc05e1e2b9a5654458f5f48dbbd8f6d0026
font_01_sfnt_off0001394d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394D 10896 bytes
SHA-256: 10eef6a52b6da4dcc345bb1e0283d7dbfc7a94cde6823f5061a3a419ce841e5b

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