Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72e4cec75e35548…

MALICIOUS

PDF

76.7 KB Created: 2021-03-02 02:13:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 196c7ea63d573f4111fbff369d219869 SHA-1: f27133d1c8d6f54e927e29d5b97c86354d9ca4a8 SHA-256: d72e4cec75e35548f4577c35070b49ad8ca92426bb57f49f75469399c4b5d9b8
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be a corrupted attempt to present a user manual, likely to disguise the malicious intent of the embedded URLs.

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://nipisod.ru/award?keyword=swann+security+camera+system+user+manual PDF link annotation
    • http://kovamuwaropepu.getenjoyment.net/a_que_edad_se_puede_comenzar_a_tomar_colageno.pdfIn PDF document text
    • http://rojenugilin.22web.org/24747441681.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/what_is_required_to_become_a_public_relations_manager.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/representation_and_the_media_featuring_stuart_hall.pdfIn PDF document text
    • http://gudelew.mywebcommunity.org/89982901713.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/74324991435.pdfIn PDF document text
    • http://limevekobo.iblogger.org/32128724072.pdfIn PDF document text
    • http://pijonon.22web.org/52450847173.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saluwagasa.onlinewebshop.net/nd_kapoor_business_law_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/93442564233.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/40789134977.pdfIn PDF document text
    • http://feferabi.atwebpages.com/fujemofoz.pdfIn PDF document text
    • http://lekedoxe.rf.gd/frskringskassan_frldrapenning_guide.pdfIn PDF document text
    • http://jemileti.atwebpages.com/how_to_learn_latin_and_greek_roots.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/80894741035.pdfIn PDF document text
    • http://riremim.rf.gd/kalekazazuxelamada.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/ransomes_bobcat_mower_review.pdfIn PDF document text
    • http://patenat.epizy.com/bengali_short_comedy_drama.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/i_m_an_albatraoz_song_ringtone.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_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 5244 bytes
SHA-256: f0f27603d26308f699d22092818f5458bb7e6e0315acbf1108c38a7dc92f7418
font_01_sfnt_off0001015d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 10688 bytes
SHA-256: 04e45c66636e428a8c98403b73a67bf00c835a3263e3ae11b8a0e5ff7e944b97

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