Malicious PDF — malware analysis report

Static analysis result for SHA-256 78924b85ff0dcd0d…

MALICIOUS

PDF

79.1 KB Created: 2021-05-17 04:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: de8363fe37ba6578e87a866204c9328a SHA-1: 537821076a1b78b1ae835df91307a50f9e0e9707 SHA-256: 78924b85ff0dcd0d3751d9af4cc06d73e7bc482e5a5c2aa5db5cfbf06b07de78
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=fruit+of+the+poisonous+tree+doctrine+philippines PDF link annotation
    • http://chatik85939775.fun/radawumakewusodpb3a.pdfIn PDF document text
    • http://astropsychology.site/50522342157jf96d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367294/normal_5fe315f3c89f8.pdfIn PDF document text
    • http://lobotazawarew.iblogger.org/pejodedodemirawujufozi.pdfIn PDF document text
    • http://maturibcgj.space/critical_ops_hack_freesvk0t.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/aashto_m145_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_6010859f9a991.pdfIn PDF document text
    • http://nisaledax.iblogger.org/physical_properties_of_metals_and_nonmetals_worksheet.pdfIn PDF document text
    • http://ideaita.fun/bavesebikanijuwd52w7.pdfIn PDF document text
    • http://reweder.site/my_favorite_things_sheet_music_pianoa9ima.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468553/normal_5ff2abc93e54d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527345/normal_5ff5621947cb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454671/normal_5fc6adc92ac00.pdfIn PDF document text
    • http://norikaloro.mywebcommunity.org/89904846465.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/sensory_memory_psychology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454046/normal_605247090e339.pdfIn PDF document text
    • http://pe50off.info/an_introduction_to_stata_for_health_researchers_fourth_editionn3a6g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_5fe9926c8602f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dixabaxoji.epizy.com/kitalopisarekewitisiru.pdfIn PDF document text
    • http://vewawisu.onlinewebshop.net/bernard_lewis_livres.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_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 4988 bytes
SHA-256: 6365d39cd05407becb5657a85622a95345521d2b2ce54d15b4e0eca4dc604055
font_01_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 10728 bytes
SHA-256: 74597ae6299b6ecea5ec2121b0823fdf07145521af2136f9f5447e181e29ab85

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