Malicious PDF — malware analysis report

Static analysis result for SHA-256 1782a7c2bb010cf9…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 14:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb30e008623d929a0e45cc66bb37b131 SHA-1: ae0afb4fff109c7c916b499e02e766cfae1a86d6 SHA-256: 1782a7c2bb010cf966efc56db651fc37e78dc1ccf060fb5ab94091e33ddf7ca0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it is a phishing lure. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's intent is to trick the user into making a phone call for fraudulent purposes. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/tebawilolusimonajoginoton.pdf In PDF document text
    • https://duproject.com/uploadEditor/files/42480774720.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/cttchq9vdvg1i1k4urlovvd0vq/ferixasoj.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161341edcb0eab---jewitusakununu.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/98494724649.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/fefajavobiluvarewo.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/28584144661.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/41463348302.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/35562328608.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/sufaj.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/detarukesuzex.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/6962715279.pdfIn PDF document text
    • http://carbonelite.ru/file/reruzuzagezowu.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/46766439533.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/kugalujet.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/lekuwomar.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/bojapizojafiw.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/59625980109.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/28796727482.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/kuvivakofobupi.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/gupumanakekezaxuji.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/ritejimuzepepukojovipij.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/22203613710.pdfIn PDF document text
    • http://lamay.de/userfiles/file/72977276626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=multiple+accounts+apk+chinaPDF link annotation
    • 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_off0000b43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43F 18944 bytes
SHA-256: cf6dd1485d549ba9037972d1319e22eada0e05124135ffd10935db49d80d0f32
font_01_sfnt_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 10556 bytes
SHA-256: fc9a171ae8969b8f602ffc33fa58e2fc6c5f2e59f9bb12080020fdf2ba20d208