Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4e564b351dbe05…

MALICIOUS

PDF

187.5 KB Created: 2021-03-31 10:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 166cae7c5ed7cfdf998cd5447c340b56 SHA-1: 5b2e6a394159b30a9fcacc83bcf7ad2b6e746d30 SHA-256: ba4e564b351dbe0580a40f40fac7b59e4462ce7a09876b10c7e1fc1c2224140d
126 Risk Score

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 0.9984

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://maypoin.ru/award?keyword=bharathiyar+poems+pdf PDF link annotation
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/b1277ea19425dd9.pdfIn PDF document text
    • http://bekasopeli.22web.org/say_something_lyrics_sheet_music.pdfIn PDF document text
    • http://kerubidezarido.iblogger.org/catarsis_emocional.pdfIn PDF document text
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/zinavaxufemilofifo.pdfIn PDF document text
    • https://jewutejaj.weebly.com/uploads/1/3/1/0/131070173/4260654.pdfIn PDF document text
    • https://zofoneparadi.weebly.com/uploads/1/3/5/3/135341866/9642497.pdfIn PDF document text
    • http://boxosusig.22web.org/five_nights_at_freddys_4_free_download_mac.pdfIn PDF document text
    • http://lemumelubijene.iblogger.org/63013587087.pdfIn PDF document text
    • http://nda.emadionline.com/Dua/Dua-Arafah-Hussain-GhareebIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vomonulesew.rf.gd/what_is_think_critically.pdfIn PDF document text
    • http://toxasetakibo.rf.gd/andhra_bank_account_opening_application_form.pdfIn PDF document text
    • http://zezinoretebeper.rf.gd/kgb_archiver_2._0_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d523e82e-354a-4f9d-9744-80b28e03a1bb/rulitamokuguvinenex.pdfIn PDF document text
    • http://bomigezi.epizy.com/breville_bambino_plus_user_manual.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_754afac52f924f62b6a3921c73a4a1ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f927a87f-eb9d-43aa-b3c8-c32584b3ed74/80457852832.pdfIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_35d9306f865c456085294458df934289.pdf?index=trueIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_94b3b8cce7f2419195c445f66c7b4b9c.pdf?index=trueIn PDF document text
    • http://vavijirodujozi.rf.gd/pie_graph_worksheets.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_c40bef7990a54de086d8544a62998610.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da5baa0-1e3b-42fd-871e-85ff3b059ccf/hamlet_book_citation_mla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c833f42-68eb-419a-92cd-f576fc0ff8e4/what_is_the_summary_of_the_story_of_beowulf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b3e59d-6c2b-4f79-9df7-e1c72887cb28/sawexusogejepaditewifena.pdfIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_6979f0cf69334d60b49ef339f35906fe.pdf?index=trueIn PDF document text
    • http://fazozogujezeto.rf.gd/dasagaluvu.pdfIn PDF document text
    • http://sabenimuzu.rf.gd/muzudonesujebimeja.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0002a17d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A17D 36296 bytes
SHA-256: 24c0241fe15031725ea9e89843980686551eaa2d641c23d52d06f9ec6a2869e6
font_00_sfnt_off00026b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26B9E 5400 bytes
SHA-256: fe00bfd266c23286b8c0b6d528c1d11e8a53198fa0ea93be13a11a88e130072c
font_01_sfnt_off00027dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27DDA 10428 bytes
SHA-256: 8e6bd98fefef228c98cbdf68002eb80f42deef7c18d05badef27e9e2602ecd2f