Malicious PDF — malware analysis report

Static analysis result for SHA-256 5814f09a72abd255…

MALICIOUS

PDF

96.2 KB Created: 2021-02-18 16:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8805bf45e75a06637dcc6ff1b5e35c22 SHA-1: 6ac70b931f8ebf76cb9568dd97dbcd67c8afd624 SHA-256: 5814f09a72abd255b26a3860fd3444f0d639742e68eca3a3bba6caab5158ee54
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The embedded links, such as 'https://yafferge.ru/aws?utm_term=nissan+%252F+infiniti+bcm+%2526+immu+to+pin+code+calculator+4.0', are designed to lead users to potentially harmful sites, aligning with phishing or malware distribution tactics.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=nissan+%252F+infiniti+bcm+%2526+immu+to+pin+code+calculator+4.0 In PDF document text
    • http://roxifij.22web.org/carcassonne_board_game_guide.pdfIn PDF document text
    • http://republvinb.fun/canada_s_food_guide_servings_for_adultsgzhh3.pdfIn PDF document text
    • http://craftsmansmetics.com/plato_algebra_2_pretest_answers6ac40.pdfIn PDF document text
    • http://skout.tech/zubixnbts5.pdfIn PDF document text
    • http://pegajopakazo.22web.org/69584816807.pdfIn PDF document text
    • http://vbruti.site/interesting_facts_about_hispanic_heritage_months7tqw.pdfIn PDF document text
    • http://jilet1.club/kendall_kylie_combat_boots2s0gu.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/les_conjonctions_de_subordination_exn4853.pdfIn PDF document text
    • http://predouche.xyz/blank_face_sheets_for_makeupzd34a.pdfIn PDF document text
    • http://elinekici.online/bakhtine_esthtique_et_thorie_du_romanp1l4g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://popeganezawojeg.rf.gd/tuzagomuxizafuma.pdfIn PDF document text
    • http://suzurexitumafod.epizy.com/best_manual_meat_grinder_2018.pdfIn PDF document text
    • http://jujeludapivibiw.rf.gd/nifadibizojuxixuxanato.pdfIn PDF document text
    • http://netifikapiwi.epizy.com/springer_conference_template_overleaf.pdfIn PDF document text
    • http://karuserewojax.epizy.com/chord_progression_midi_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/67185209594.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001513c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1513C 20448 bytes
SHA-256: 7bedf6544afe5049d2781b993a44a438888a635b8b1092836eba2e6e396228af
font_00_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 13132 bytes
SHA-256: 708331e71e5afed7ff0c6a0c1db59f88593ff7d05d6e643e982c99ffb4081aca
font_01_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 5044 bytes
SHA-256: 702033f6bfd94f662dd4ba536e3f0edf0468d4c6c0c64022cd2a5a6366a14a92
font_02_sfnt_off00012aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEB 11260 bytes
SHA-256: 1cfe7b25bc2b4775d96b18e4e17047728f623fdda4955564bcbacad2adbea162