Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec853f5cfc3222f7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 21:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0479e3f054b6fcab0a2604eaf817e5e3 SHA-1: 18300e8449de636053995328703b18d6ec58f526 SHA-256: ec853f5cfc3222f7a2708144775b73c04d3bd3fcacc9712911fbed5de9ace9e5
134 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, many of which are structured as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing lure designed to facilitate the download of a second-stage payload.

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 https://smidgel.ru/uplcv?utm_term=episode+apk+iphone PDF link annotation
    • http://status.cz/UserFiles/File/vozafan.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/2567443947.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/70008702151.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/miborukivowo.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/77974869240.pdfIn PDF document text
    • http://cloverdiamond.com/file/47256400035.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/13459295199.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/17923997014.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/mikikuruparemex.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/ziwowojojiwiloxapasemopo.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109042259401344.pdfIn PDF document text
    • http://centromp.it/userfiles/files/98882401584.pdfIn PDF document text
    • http://fpole.ru/sadm_files/visapo.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/warapeguzibilasoz.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/70554247567.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/libarisufumudo.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/didefatasusikojunolu.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/zexozepudujojufava.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f3f5d162c---tetajizepajutadejoven.pdfIn PDF document text
    • https://webmenuplus.com/images/file/82699424281.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/26486535696.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/nerawof.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/fiwaxure.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161345b1e63d00---21837507338.pdfIn PDF document text
    • 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_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 10320 bytes
SHA-256: 807b920749bf8ff686ae92f2fa2618a435f641d472eafb325a9f5354f48c36f1
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 18140 bytes
SHA-256: 1be37cdbc65fa8326de9f306e9fa36ea1d4779d4486449c13f0db28c9f70d131
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1