Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d28ad3ad250775f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 02:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f26cdbbd585411c78db40d0340c96b16 SHA-1: 59e3b42716ebb685f10ec5049909102a4277bc12 SHA-256: 9d28ad3ad250775fc4c31e210aa11865cccd833fb623212c06b36289d7c5d4a8
146 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains multiple external URIs, including one pointing to a raw IP address, and is described as a link farm on disposable hosting. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong likelihood of phishing or malware distribution via redirection to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://elemonbg.com/Files/File/munatumepariluzosevate.pdf In PDF document text
    • http://tokyoto.pl/UserFiles/file/suwefarubolepeboxuwog.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/65590793599.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/37554543923.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/fixabasudu.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/gozoku.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/76267565592.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/zotosapekojijiwam.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/94704616003.pdfPDF link annotation
    • http://constantemail.com/userfiles/file/1630910811gudiritorufuvadasusiro.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/us6bov1l1lu3vhj4qro8irrt3c/tukigezexuxulusexem.pdfIn PDF document text
    • http://badgerhillfarm.uk/serolosexetoz.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/pifozuxozele.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/87758892060.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/pofiles.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/sipevigogewef.pdfIn PDF document text
    • http://mlight.cz/archiv/file/54095613861.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/30762932993.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16145ee4e8043a---keruperipoba.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/wutexip.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/23438101349.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612feaa19914d---gukofutavapafedalu.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/penopebigefiwelakun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+use+apk+file+on+pcPDF 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_off0000b044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 18064 bytes
SHA-256: 4ddda1545ea3ffdcf37075f81ea37c20748c6656c760dc50908160ceac02a856
font_02_sfnt_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 10640 bytes
SHA-256: bbbb287cbd34deb170501261d6fba74d9692bd041effd7fff08694dd721c6e3b