Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adb37be539d3137…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 18:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb18799765cabafe7d772231deca85cd SHA-1: 53aa952e48f8ce06c838630dcef771e90ae38b58 SHA-256: 3adb37be539d3137daa35f1bb7e7ac17c42e499ac251983681c871daad47f45d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=unlock+all+skin+ml+apk+no+password PDF link annotation
    • https://verandapattaya.com/userfiles/files/42644263520.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/gepadukovitoxizonodanig.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/98143622210.pdfIn PDF document text
    • https://proia.bg/userfiles/file/38292794821.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/53188673047.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/kesawevor.pdfIn PDF document text
    • http://grandfiltr.com/files/file/31044598143.pdfIn PDF document text
    • http://theponghop.com/upload/files/moserupopowibot.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/46960281479.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/rubixologinafelepo.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/39444231944.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/xizawo.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/ratifuwupaviwuf.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/31781687357.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/39255717669.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/sanomibugetibijetavu.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210912073841.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/23387101327.pdfIn PDF document text
    • http://ledins.lv/cms/file/vatekakobozuxak.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/80759987914.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210905_213600.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/78089101242.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/24623803125.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/17072264862.pdfIn PDF document text
    • http://chayka-svg.ru/files/72113585556.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_off0000de2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2E 10632 bytes
SHA-256: 15880befc7516980309eeec15153bf5ec04c2a691918cd975f5e6e681ddbe856
font_01_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 17860 bytes
SHA-256: d5329bb223a5b884c68a4597b78570160236c899d5b27111d1cdc11f39be032f
font_02_sfnt_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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