Malicious PDF — malware analysis report

Static analysis result for SHA-256 f160df9636d4a0ce…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 12:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0999b15c22ba4ae8ad35978d104a97fd SHA-1: e31c1de730d9c2b30fc0a324480d28e8d8c4bd54 SHA-256: f160df9636d4a0ce35831b67d4b53cd0101e3623b4deea31e4f1bd8939e11cf5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable domains, suggesting a link farm designed to obscure malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://fohow77.ru/upload/file/49813280521.pdf In PDF document text
    • http://www.drivingschool-brno.cz/files/files/88056147962.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68b2898c3---pogaxexetej.pdfIn PDF document text
    • http://home-plast.ru/foto/files/newokosiluwo.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/48137238619.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/waxinudupa.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21827168788.pdfIn PDF document text
    • http://orderkai.com/uploads/files/duvota.pdfIn PDF document text
    • https://edex.co/userfiles/files/losutafenupurokigatekapo.pdfIn PDF document text
    • http://parfumland.sk/upl/4774651419.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/wiwidomamepafitu.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/30221994041.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/vevukexadukewapowaniv.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/88461338444.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/kasuxurikokorek.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/zatulo.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/pozemajetunavuvu.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/takiluvipusubeboxebusa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/39955939276.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/wijetowumumuzabutugi.pdfIn PDF document text
    • http://knipia.com/userfiles/file/58520059203.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/73291130459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=vidmate+audio+video+download+apkPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/20490475219.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_off0000d538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 10596 bytes
SHA-256: 38e0d2f1a695be1c2ed68aebbb94dbe8302cfbeb668324c4e8557644eb2e9fc4
font_01_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 17608 bytes
SHA-256: cbbe06123d947dafa8450a2ebeec2a44c69508ed7e123733a4d60e70228256af

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