Malicious PDF — malware analysis report

Static analysis result for SHA-256 c784e92d163dae07…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 19:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d4e563325a079d585b032ed8bc2575f3 SHA-1: 2dba17410a8b8b99fbd1ed8116137fef2560a1a6 SHA-256: c784e92d163dae07c2d8f5454878f0af2bfd3af1f25723155f6afd1dc0e367ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, and a high-confidence ML classifier flagged it as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using many distinct, low-reputation hosts, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the nature of the PDF and the heuristics suggest it is designed to redirect users to malicious content.

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://ecableapp.com/FCKeditor/FCKimgUpload/file/nelixazopalabefizepiwexak.pdf In PDF document text
    • https://biocoils.com/img/file/zoxigizafebozikado.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/gimolikozepadetevenebi.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091411293873499.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/36362401432.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/kelonadolopekirazokezi.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///winoroxag.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/32129373883.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/runutenasegelowosud.pdfIn PDF document text
    • http://leeandrewdavison.com/download/4020829421.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/5234495700.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/dekederakigerudesexipawi.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/lujomuvozopes.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/92728853530.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/13149684138.pdfIn PDF document text
    • http://snft.ro/media/file/90576929738.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/70283004356.pdfIn PDF document text
    • http://shriramsteels.in/public/ckfinder/userfiles/files/simokobe.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/92955565551.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/25356294296.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/13741897736.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee490acff---lojonemilemub.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202193053195274.pdfIn PDF document text
    • https://dukupahit.com/contents/files/davivos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=octane+burning+equationPDF 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_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 18712 bytes
SHA-256: 56a1d266bcbc75d2a191102e4a3702b6eecabbab991b1f60d073e57284669f42
font_01_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BA 10600 bytes
SHA-256: ccbf846aad5629a58fdd50728693145093006dfc1e62aa2899b4c185425c72f3