Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b50ae0104834600…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 15:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f43e9ca8627220b532829241595df291 SHA-1: c81ff0f048891626a8b4910ca0bb1d2bcef960cb SHA-256: 7b50ae0104834600064a425ae0aa4641b26484a6597111437ff9508b650d932d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous disposable domains, a common tactic for phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content, likely through a mechanism that would typically involve JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://baihsad.com/userfiles/files/20210914_101233.pdf In PDF document text
    • http://ferramentabelleggia.it/public/file/16908302544.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614007c959e26---noruxeg.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/35566913277.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/wukavud.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/146094891.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210916033041.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/38194574881.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144576c32e5d---92644635611.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/73115049375.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/14572224738.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210911_08222B2A7F56624D.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/93582619807.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/48583179292.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/30461341184.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/82923901387.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/6495045729.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/jiwakuranejexifefebuxon.pdfIn PDF document text
    • http://zxsolar.com/d/files/71602833560.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/dasumixe.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/36429578104.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/41653423956.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/rogaleliduf.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/rebosetoluxamijijexar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=star+wars+galaxy+of+heroes+mod+apk+android+1PDF 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_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 18044 bytes
SHA-256: 61f6679ea8312697a6c02b8366a2c5f8e158f3bd1b33f5f8dd6de0a96e907052
font_02_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 11464 bytes
SHA-256: d4b17e5bdf4b2fbb966f83304624100ec3ac0231d6de68de1a1d9a7ea50d7e93