Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a726ca81de02314…

MALICIOUS

PDF

99.9 KB Created: 2021-03-31 23:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ba3cebd686dbaf84e7ff6b86ed703230 SHA-1: be13233689bc49b6deaec9e7c2dcd0ba4be1afa5 SHA-256: 8a726ca81de02314a22989627d815194af8607e3406de3200a93dd0af97c1333
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://botokaw.ru/award?keyword=rumpelstiltskin+brothers+grimm+pdf PDF link annotation
    • http://bitawulam.iblogger.org/human_centipede_movie_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373004/normal_6001a7a32307a.pdfIn PDF document text
    • http://figojusu.iblogger.org/taxes_subsumed_under_gst.pdfIn PDF document text
    • http://ludexeliviw.22web.org/kalnirnay_calendar_feb_2020_marathi.pdfIn PDF document text
    • http://nutunajika.66ghz.com/mozilla_firefox_developer_version.pdfIn PDF document text
    • http://xasumemazekejo.scienceontheweb.net/add_text_to_using_adobe_reader.pdfIn PDF document text
    • http://bubuwem.iblogger.org/sozexasevifofobaxadopubi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413578/normal_5fe1b4a481ab2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491723/normal_60322ac34eb45.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/percy_jackson_and_the_sea_of_monsters_movie_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424696/normal_605b0cd48b2dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410717/normal_5fffa77508f2b.pdfIn PDF document text
    • http://jatepot.22web.org/tv_show_pitch_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f37ac059-8e92-4d5c-8f60-816e746a5317/98362845238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86df5bb2-ebaf-4874-a2e4-283e9da66a8e/cuales_son_los_signos_vitales_normales_en_un_adulto_mayor.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_e417580796d44aa593646db50a6e3f6b.pdf?index=trueIn PDF document text
    • http://mozaninukokefef.onlinewebshop.net/kemojisijonorisekovo.pdfIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_6533f305ece0459e9c1054cd03f5bca3.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_975a3cfd43f845309f1b9a8ad3e01fbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/421cbf98-08c1-4756-b570-15507d5a4aad/fallout_4_map_expansion_mod.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_872943d41f3a4df7a0951c47d84b1248.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d51b47e3-3f19-41af-b38c-6c9dabc80ca0/skyrim_how_to_install_mods_on_cracked_version.pdfIn PDF document text
    • http://jujilopuvij.rf.gd/42347034344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6efdd8a-c9bf-4ad4-926f-5229dd37fbb5/15309387936.pdfIn PDF document text
    • http://fixafuxebiwi.rf.gd/89534028918.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 5400 bytes
SHA-256: 81fc231f858ded2a596386f79774584ea1bbb4e87f78f5445af37d1c78a709b3
font_01_sfnt_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 5456 bytes
SHA-256: 0cd3e2fac7270b315d8208134bc3952d3f770176b89f8d068609dd2c57ba930a
font_02_sfnt_off00013199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13199 18948 bytes
SHA-256: 9e37ce75977a73b939316e7a6e4627fe2a3739135ab486e318f373f600179ba4
font_03_sfnt_off00016989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16989 16660 bytes
SHA-256: 2deff8a3cef25babe80b248eb31a97e8bab9a52c21591971eddd7888546035a8

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