Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaeda4151ca32492…

MALICIOUS

PDF

93.3 KB Created: 2021-02-03 04:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 28316898a05258cbdafa13f9041fa765 SHA-1: 971d2b7c43a60fc27e92fb3e4892112a48540c2c SHA-256: eaeda4151ca32492612e9a83496cba59ea1bd7c7ce5416ccdd83d0f5aa9851f9
146 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating malformed exploit streams and a link farm on disposable hosting. The embedded URLs, such as https://seumenha.ru/123?utm_term=15+day+reboot+with+joe+pdf, suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an exploit or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://seumenha.ru/123?utm_term=15+day+reboot+with+joe+pdf PDF link annotation
    • https://cdn.sqhk.co/jebumujo/c0gdHhj/fanatical_football_mod_apk_revdl.pdfIn PDF document text
    • http://sungo1.space/konatiwobebumanozobatufar4b77.pdfIn PDF document text
    • http://boost-store.net/534721611010e65a.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/hdqjcB8/vomerine_teeth_are_present_in.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/1ufL58I/37117174277.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/io0Ghdw/tizumanerosurubivesadox.pdfIn PDF document text
    • http://muwabiva.iblogger.org/sojudi.pdfIn PDF document text
    • https://cdn.sqhk.co/fipuwemupe/a0UifOh/dijuxuposebakokif.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/icr3Big/haunted_walking_tours_new_york_city.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/pelhbgh/the_information_center_of_the_cell.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/Nhbhihj/smash_badminton_academy_electronic_city.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/1hhjhDk/final_fantasy_4_the_after_years_wiki.pdfIn PDF document text
    • http://wonnaturila.space/582957734876er54.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/FWifhe1/61194432193.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/janodojivi/aparatos_de_ortodoncia_para_nios.pdfIn PDF document text
    • http://batogejupimole.rf.gd/sobifebesixazuviletaxi.pdfIn PDF document text
    • http://jawegoxizifiti.epizy.com/desktop_moving_wallpapers_free.pdfIn PDF document text
    • http://purokazurawilew.rf.gd/crochet_flower_pattern_free.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_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 5408 bytes
SHA-256: 7d2484be3860a9117e39d90c432523e9826a2ad3af1f5f3804a5d0bb6564418c
font_01_sfnt_off000140fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FD 11540 bytes
SHA-256: eceefaf4ff491f4c1f9fee24060a0f6043c8760b5a0ab5a3afaa89818ee9c78d

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