Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35790a3d495fa43…

MALICIOUS

PDF

87.5 KB Created: 2021-03-08 18:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b9e6ff39c6de473da6525ff4e2f9151e SHA-1: e4add9a75106f6ea3fdea722bf235dca786bd9b2 SHA-256: a35790a3d495fa4360c858c631a88778eabaf2e7094dedeb902bd49741a54f8c
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 embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, a common tactic for obscuring malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/award?keyword=manual+de+administracion+de+empresas+pdf+gratis PDF link annotation
    • https://cdn.sqhk.co/vedasukuki/jdiiehg/mens_short_haircuts_2020_thick_hair.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/brookstone_wireless_speaker_recall.pdfIn PDF document text
    • https://cdn.sqhk.co/zijatiki/agijhhj/ditixa.pdfIn PDF document text
    • https://cdn.sqhk.co/luzorisu/NjcVijy/sebazodijakaxibelor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_6016ed09cf460.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/iebChe8/wijuzogokot.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/44875986180.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/hhx8jb7/audi_field_club_seats_dc_defenders.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fde5dec8afb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_601a9d05c7064.pdfIn PDF document text
    • http://norasuzajo.mywebcommunity.org/jimaxelifajivenalozonozab.pdfIn PDF document text
    • https://cdn.sqhk.co/sarafogu/iXhfPPy/how_to_cake_it_step_by_step_website.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496193/normal_5ff84c54cf9dc.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/91511026907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471083/normal_603b95621d2b1.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
    • http://zitasixan.atwebpages.com/is_the_revenant_a_book.pdfIn PDF document text
    • http://vifidumefitur.atwebpages.com/brunswick_string_pinsetter_cost.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/call_me_by_your_name_book_second_hand.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 5360 bytes
SHA-256: 12f59535e2af684570e495898e0e31299066a171c2471628777443e12d0cf3a0
font_01_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 11124 bytes
SHA-256: 13b865dded73086f8cc6a63443aa649e029bcbfc55d2fab92472e34dcf0fb6ab
font_02_sfnt_off00012af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF0 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660
font_03_sfnt_off0001407b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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