Malicious PDF — malware analysis report

Static analysis result for SHA-256 81db0ba847d31a6c…

MALICIOUS

PDF

69.0 KB Created: 2021-04-07 02:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 598ba5bb00be24faeec88c274022290c SHA-1: e5396b0289506fb462787c1d24d42c516723c843 SHA-256: 81db0ba847d31a6c945762c4280e22e79e7dcf50f32aaa07ec9e439e04797401
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external domains, with at least one heuristic identifying it as a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to 'Pet cambridge pdf vocabulary', suggesting a lure. The presence of external URIs and the link farm heuristic strongly suggest the PDF's purpose is to redirect users to malicious websites.

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://xezojetit.ru/award?keyword=pet+cambridge+pdf+vocabulary PDF link annotation
    • http://godulonu.22web.org/google_feud_uk_answers.pdfIn PDF document text
    • http://kprovk.xyz/marketing_executive_jobs_in_hyderabad_freshers86tgh.pdfIn PDF document text
    • http://tehnotop.space/software_tester_resume_canadarsws2.pdfIn PDF document text
    • http://kataeta.club/manualidades_con_reciclado_de_botellastdcbp.pdfIn PDF document text
    • http://national-verifyteam.com/wuxisarunurwspnx.pdfIn PDF document text
    • http://price-list.moscow/any_day_of_the_week_sentence_starterstauje.pdfIn PDF document text
    • http://figupatofewox.iblogger.org/mugupugopibo.pdfIn PDF document text
    • http://skameyki.club/byomkesh_bakshi_comics_free_download6fs0m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456687/normal_60318400d7271.pdfIn PDF document text
    • http://valesoxolowid.iblogger.org/65711189292.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/45678206464saya8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477655/normal_5ffe58c4d1a5c.pdfIn PDF document text
    • http://top-shop-store.website/cg_vyapam_tet_2019_answer_keytybei.pdfIn PDF document text
    • http://rugozuravonabib.22web.org/43200804293.pdfIn PDF document text
    • http://perebobusagu.22web.org/galaxy_s5_camera_unable_to_focus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sejekowosabukog.epizy.com/afspa_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b4c897-859a-4f50-b864-b59d08ad5b2a/ms_7778_ver_1.0_socket.pdfIn PDF document text
    • http://dusefepov.epizy.com/bulexunakebumif.pdfIn PDF document text
    • http://tugupora.epizy.com/bogazomaritijujirir.pdfIn PDF document text
    • http://tagetebaj.rf.gd/mufowuva.pdfIn PDF document text
    • http://zutagisite.epizy.com/sodedigikidadalopit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/989d9c77-6b1a-457d-b46b-0b4f80abe18d/will_voyager_reach_another_solar_system.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_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 5600 bytes
SHA-256: 8060cd02fd5cb173b95b54621b2c1ebc4a8337927cbe640e8491f68a7e3286cf
font_01_sfnt_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 10872 bytes
SHA-256: 43e48612f05364133e91412c12b361cd46ff790422655288ef67ea9b9e49eb3b

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