Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8371c141339286…

MALICIOUS

PDF

72.9 KB Created: 2021-09-25 20:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d50301c52ddf3f1fb16d94f811a56da SHA-1: dee158ddcb0371b50fc6b8f6759adebe1653da61 SHA-256: 9d8371c141339286f042fb5c52e65e44044722580bc54c19f7e54ad37c8ec7bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, and is structured as a link farm, likely to distribute malware or phish for credentials. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://shibbirs.com/media/files/15973979514.pdf In PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/60013665287.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/39664230050.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/vomusumorenigudir.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/60671036401.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210911_175447.pdfIn PDF document text
    • https://hum639hb2-hh38.com/contents/files/darotinotiwifawiju.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/22409208369.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dixuja.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/4017673654.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/72897947391.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/tasobasazukomebow.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/jovesela.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/dikulemixilozumogobefifib.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/83136294985.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/30465949490.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/74258325109.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vedaz.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/musategojekuso.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210913072033.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/juwusozufofegaket.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/92151031034.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b022c78b6---9202652134.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/76684719363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=twilight+2008+full+movie+onlinePDF 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_off0000b6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A1 17640 bytes
SHA-256: fdaf29c612ea179db2e117deffbe328e6b900831abd79a62433bedfcd5181d33
font_01_sfnt_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 10896 bytes
SHA-256: 93b77b843b2ef415ffbe5be42726a719a89ec106edd30179fbb85bb32d266080
font_02_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1