Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b80dd592cc9c606…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 14:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57ce510f868b4838f826139b32dcd4ec SHA-1: 962e23c3d8703b2aa5ae023c6601fb22bd07cb65 SHA-256: 8b80dd592cc9c6065ada1a34758ce650ee9227ac8158d6df181d7c6d9dd68e9f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of a 'download button' heuristic further supports a lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://behbehaniprojects.com/uploads/files/wopin.pdf
    • https://danfort.lv/userfiles/file/mokivewolole.pdf
    • https://medbioplast.com/klucharnet/images/file/3474792327.pdf
    • http://jaqalsports.com/files/file/xujilezukisezevoz.pdf
    • https://homestayhoian.vn/uploads/image/files/49452299040.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161423d8d99ef7---fefero.pdf
    • http://market-oborudovanie.ru/upload/file/kujuwadojosikavokalubiluv.pdf
    • https://ontech.vn/images/ckeditor/files/4084088178.pdf
    • http://www.flamanville-76.fr/upload/file/sorexakotev.pdf
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/junafunegarevive.pdf
    • https://escolaalfa.com/userfiles/file/vusigijetagotekajor.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161400754ecb5d---13215191224.pdf
    • http://khmim.com/ckfinder/userfiles/files/korunukabifagez.pdf
    • http://friulanamarmi.it/images/file/91204049941.pdf
    • http://amandamaitland.com/images/file/dakegenirijinatesopofod.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/sunevofosanaf.pdf
    • https://dhrc.in/userfiles/file/8608035390.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/89967558305.pdf
    • https://coevent.ru/upload/files/fisavumokefagebumerubug.pdf
    • http://kiavysocina.cz/UserFiles/File/51543255832.pdf
    • http://medizator.ru/ckfinder/userfiles/files/suvetowaxebuj.pdf
    • https://vleek.com/uploads/files/fozidujavusovug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=amazon+cube+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 16792 bytes
font_01_sfnt_off0000e7bd.bin
fa4209423daafaa184a7837106e1bbc4bba93e8d1ee59327cc1fafd77f3b3743		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 18436 bytes
font_02_sfnt_off000116c5.bin
25511b2e4b2c96c71e984d1055f7e8efb9476d9672958f91d33b4074cf589f17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C5 10404 bytes

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