Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c8764de065e0c1…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 16:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5bf052c5ca98f33f0a984bb5b2ab5360 SHA-1: 77fd45915026cb8ddfd0e6b1c163157545bd8f40 SHA-256: 12c8764de065e0c1b66dfafb79f313f71dc10a06ecae5c371409a64e614fb53c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a download link. Heuristics indicate it's a link farm on disposable hosting and a callback phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=multiplayer+driving+simulator+download PDF link annotation
    • http://artvideo74.ru/upfiles/files/30170852486.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210916193006.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/30475360321.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/rasijadamu.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/risarad.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/xeguwadolamexuzamukekaset.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tagowaxiru.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/nokezukaja.pdfIn PDF document text
    • http://panova-art.com/files/file/modes.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614464c49ab8e---52149335559.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/wusebafibi.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/83483243240.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/63846569090.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/59833922736.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/65652194864.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/bozofelimuvi.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/36960483736.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/siradoxi.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/23647920613.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/sebamuwa.pdfIn PDF document text
    • http://vitrine-prof.com/files/pukosupetotebibevukugoji.pdfIn PDF document text
    • https://grandegroup.net/files/zajikalinasademis.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_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 21648 bytes
SHA-256: 01b371a56f899c89b9ec1188ac4390427ccf58aea5c6182aad5672ff1c432a4d
font_02_sfnt_off00013152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13152 11096 bytes
SHA-256: 0059996828ff566a3ac9ccaa43a2ea4bcd4790c874d30435d78924d8cb693aee