Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05c6bf6df275b72…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 23:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 669e6a0e4666a99392d930b984052bf6 SHA-1: e7eda9e6f7a524fb61a3f0fa6c4ce7ac32fd4580 SHA-256: c05c6bf6df275b72a5f800caa71a1865aad585d511438480b3b86b44d81197d4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a callback phishing lure. Although no document body text was readable, the presence of numerous embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing attempt. The PDF structure and embedded links are consistent with techniques used to host and distribute malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pima-alarms.eu/slicice/file/sufomobitixidifetipu.pdf In PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/33036985498.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/84762243140.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/84378067518.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202193036413144.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/27629903307.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/rovakamebaveze.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/kozepene.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/6641971193.pdfIn PDF document text
    • http://17njl.com/userfiles/files/rugorobuz.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/70417343605.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/vuwosetep.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/jenujus.pdfIn PDF document text
    • http://njchemland.com/upload/files/fabowofudibute.pdfIn PDF document text
    • http://retrofotr.cz/files/file/88579579422.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/wogakekavalabotovekiziwid.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/misowulukobigu.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210901130706_c0fiws.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a5055f85b---turonipiximewedozuxal.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/39281809810.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/zuzodorologivapogij.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/foroxitivitag.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/5865104138.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/bd5ecbc8ef4fbeaa046d88362de3fcdf/31720533179.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/47759583246.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/12821148218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=change+cell+phone+ip+addressPDF 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_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 10728 bytes
SHA-256: f820ff94e12b5daf69219b5d93cc70c8ce1ae2b7c2d968d9994ca70c154ec5e8
font_02_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 17288 bytes
SHA-256: a1365e8551828b0ae3b12734cda54d06e55edf86b9e46cbab8298b4ca2782700