Malicious PDF — malware analysis report

Static analysis result for SHA-256 34af127f91129876…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 00:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 79deb9d03555314507c80d44db59bcfe SHA-1: 1d009d000e12acad05ca2d702bbdf42cd2705423 SHA-256: 34af127f91129876b86d06478398ed5045a16c69a952ee894cfc01fca5606ef3
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 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=harvest+moon+back+to+nature+free+download+for+android PDF link annotation
    • https://gullyracing.it/admin/ckfinder/userfiles/files/91021357328.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/48113144177.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/80467390427.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/fimiwivenuzowubotiladed.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/sunekifakibiduga.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/nibeguwenixas.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/12515680885.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/75799549590.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/7045791245.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/memevofipokomabinezaso.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/puliwefiboloxefama.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090714150873499.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/viduwowafutabagat.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/75108348946.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/virebisujuzomegizuzagexe.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/17216774061.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/sifubusubize.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/94729249191.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/kaxalijonawolulowosugoniv.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/rufixetasekaf.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090809471073499.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fapunuwidimus.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_21ADA30D2AD32C61.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_off0000dd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 17384 bytes
SHA-256: 77d45882d0b769f7c6f4f71871af27711627db70e2e7dfd880351b37a7dec077
font_02_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 11112 bytes
SHA-256: 5ebb79aa58094308949fd4a75202961280e8845cc6e65453c8881193d6b6b348

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