Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9edb125ed8b995…

MALICIOUS

PDF

72.7 KB Created: 2021-09-19 01:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9835fa502a1e26f1f745686ea067edad SHA-1: 8e2cba12c34d566f3d226aa7dbbf4eaa820b62f7 SHA-256: de9edb125ed8b9958ce20184d432471e3ffd1a26676fcc2dea048327196668a4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs strongly suggest a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://hrt-foto.hu/_user/file/53637851725.pdf In PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/47321713145.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/xetupoz.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/vusepuxesepisazatubigasar.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/71772482095.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/kixebanomomasujafi.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/23733588848.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16137a62e0a3c9---divawaxamapogebedoroxit.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/88513138293.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/65751690359.pdfPDF link annotation
    • https://www.sterlingsez.com/ckfinder/userfiles/files/nosanawapagatajur.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/motibuxalivonejemetusalid.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/jituxu.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/vegod.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/65188477180.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210914_91AF9B6352133D57.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/97720275309.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/turukis.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/balapebutukoxowulisadup.pdfIn PDF document text
    • http://showdoimovel.com/files/files/46418375041.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/37229644804.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/mabafamebirerawifijufunov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=among+us+online+free+no+download+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_off0000b8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E8 11032 bytes
SHA-256: 2171d242cf9198bb7f414c266bc85f39bd5aff0079b5fe49add2db5c978baa64
font_01_sfnt_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 17152 bytes
SHA-256: f48bb2ed406f1339b66098f9f3dc35098a3243a8a901c2e9ca201d93a1a873f1
font_02_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1