Malicious PDF — malware analysis report

Static analysis result for SHA-256 db884bdd50ece43d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-22 15:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 784e5458a2357761562260dde42ae0fd SHA-1: 78f9869998b294b804394df3d0e7e5da697ccd52 SHA-256: db884bdd50ece43de14352e506aa5f09d9354bc083a94d662900d22b60466e6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=dead+island+android PDF link annotation
    • https://rhuyscampingcar.fr/images/files/gifafarosesukuvajoparuji.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/10250312912.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-13/20210913222214736064.pdfIn PDF document text
    • http://hainfelderteich.at/kopivegulowimidobivuwu.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/dovigexuk.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/39189763016.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/74215330698.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/12235568851.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/xosemitinolapudipexusukit.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/91407690436.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/pixote.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/36133167821.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dubo6mmvtrvr4mh5nmbf8frpk0/temenoberebunukowipev.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/44996769227.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411f803bd00---vusesosimitexelupunowokub.pdfIn PDF document text
    • https://aokman-drive.com/d/files/76059585236.pdfIn PDF document text
    • http://rsst77.ru/upload/files/97939583140.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210921010704-kapuxofiroguninij.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/rogidevedikexida.pdfIn PDF document text
    • http://zenkatsu.dk/files/39634230206.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/gosulalaxiribulapegamur.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EF 10144 bytes
SHA-256: 39fd3622fa9347c92737ba856d0b23bf5d82c299854075a39913d5c288de02cc
font_02_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 16340 bytes
SHA-256: d42aa4f62c5d097899f4ca83752463671ed36338d1a9962ec0518aab4c0c7761
font_03_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 24500 bytes
SHA-256: 8cbc4529d06aef5e4dd10c233f7363f24be2736a2b2080bcadd6aabf477eba9c

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