Malicious PDF — malware analysis report

Static analysis result for SHA-256 100771072ab28f8e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-10 12:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: d0ce264257077fc15eb7b0b81496eb1a SHA-1: 75d5e6ca2ecdd115bd34cf9f4ce847614fdd740b SHA-256: 100771072ab28f8e1873e26667c32e7eeb7fac2177541d145aa2bc743079eaee
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 0.9981

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://oniceh.ru/uplcv?utm_term=xbox+controller+driver+for+android PDF link annotation
    • https://newtech-utm.pl/userfiles/file/70522514962.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/zadexave.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/89833580765.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139952ddf054---lovakerumudiruxulozonavu.pdfIn PDF document text
    • https://petek.biz/resimler/files/safudoresepawejix.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/19947292371.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/suduwovexuxelopiduvo.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/paxamuvokozuwupov.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/relewamikujuvo.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/vigorufupowisupunagaraxus.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/61986726428.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210909_762D39569BE55703.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/99261293696.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/jubejozozid.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/dugavigugebegafogudujof.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210909111245_9v6sb3.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109101250557103.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/gelegegotulezeteja.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/judek.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/31743245152.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/1528733971.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/54666937316.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 10616 bytes
SHA-256: f7ed264b6bf26e14ecbc498af46833bab3350d0a4b3866f47307e5d7041889af
font_01_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001139c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 17988 bytes
SHA-256: db5040b5b7be904ade78a88914c19597700777d728e5203486547cf046bdd7ae

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