Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae750e4822b2251…

MALICIOUS

PDF

78.8 KB Created: 2021-09-10 16:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 149ef45453bc79d10588457c738d374a SHA-1: 20423d0f2de8187f88125581d342f4b14ee0565b SHA-256: aae750e4822b22514e4322790ac4e210bb29e94d729c4310c581985c0570ac0c
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it employs social engineering lures, specifically prompting the user to install a browser extension/update or to provide a one-time code, consistent with credential harvesting or malware installation. The document contains numerous embedded URLs, many of which point to PDF files on unknown or potentially malicious domains, suggesting it acts as a downloader or redirector for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ecpa.fr/uploaded/file/kasegagexuga.pdf In PDF document text
    • http://szao-spb.ru/images/news/file/45182605478.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/22813907889.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/xuvalagivirajusofi.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/xagix.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/79311020378.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/loridigesanub.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/2683419838.pdfIn PDF document text
    • http://didopack.com/files/joviz.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210908_232208.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/galetokagizagop.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/jaluvegevupomogopewaz.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/5493154648.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/19202215454.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1cf08df4---63320408958.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/50379431151.pdfIn PDF document text
    • https://limsurdua.com/contents/files/lefavilitaritupusopogam.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/wabosipaxagiloderoboje.pdfIn PDF document text
    • http://viorina-deko.com/images/file/60893757740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=can+you+run+android+apps+on+windows+8PDF 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_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 18496 bytes
SHA-256: da4360ee4c91e1227565f87ee1db3d25aa23c6c35e02fb4f46659ec753d02719
font_02_sfnt_off000115b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 10648 bytes
SHA-256: abf912bbbf586726add423846d47518b6f723e30b2814d79bf241c0a54976682

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