Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f382fdbcd5eb9af…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 13:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00319b61ed150bcee083751bb6bacf29 SHA-1: 031ad8f73c6e4479cbcc875804d18ea68c75e916 SHA-256: 2f382fdbcd5eb9af1985d542c8a2e9b2cd069ce8ccfc722f9419529b29caf0dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=application+la+poste+mobile+android PDF link annotation
    • http://aburobocon2019.mnb.mn/uploads/files/bimizopilibewitalago.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/fafuporofugajuneripedut.pdfIn PDF document text
    • https://avela.md/userfiles/file/xenatazetelatitedumexuni.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/67952333409.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/xujef.pdfIn PDF document text
    • http://p-energo.ru/content/file/gukubodebo.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/pevinulokibokevuwit.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615187108010b---bomisarepimej.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/vujuwusujunabeteleverire.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/62061212805.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/gizazapevax.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ce7f1dadb0d213de2124bf1d9e82c5a9/kazomegojelixe.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/13005873901.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/giwofinilizafopaxax.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210907_11_31_31.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210909230417962549.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/5941089847.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/65227587859.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/godajulajugofe.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/venazokenemeses.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/boboxuru.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_off0000abc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DA 15640 bytes
SHA-256: 34a0572a598c3d6623ba58c933efb01889bb7c742bc3df1897ddc6970853f5de
font_02_sfnt_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 10796 bytes
SHA-256: f0a651a934e7d8796ba7d1bcaf18fa5dab9a100cc6e9bdd9472298236a58ba1f