Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97da08a5087144a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 22:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e2313253015d780b99e9c59faa1b98a SHA-1: f0656f0bf0305ce30cc7dd935c5b05b604539915 SHA-256: e97da08a5087144a5eff703b3f3bf1e5a13836456ee0d60875e323d2c49a8ad6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to download and execute a secondary payload. The 'SE_DOWNLOAD_BUTTON' heuristic suggests a social engineering lure to trick the user into initiating the download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://limsurdua.com/contents/files/mevivesopadorumobegogadik.pdf In PDF document text
    • http://cochemical.com/upload/files/kasipokuxajumabutijekex.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/70825921611.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/54296724562.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/66334271517.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161460d4c472df---fixisowov.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/43092262100.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/27038056.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/mesuviwuni.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/81011434253.pdfIn PDF document text
    • https://fishuntpesca.it/file/23354948776.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/61979178463.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/10105583915.pdfIn PDF document text
    • https://akconta.com/uploads/files/31985245780.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/rapug.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/58886597384.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/kirag.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/3012109822.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/47389630969.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091810131162.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/21695974715.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/81462566741.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/setezulenekulazuj.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/bunovefesikidasefi.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zopufofazefimepaludalazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+install+morph+tv+on+firestickPDF 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_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 10980 bytes
SHA-256: 3059a9e83ce066bcda83ba745456234a7fb58f83e233b5626c0ffac868643f1c
font_02_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 18252 bytes
SHA-256: 083f4ef1f438c6bf4e64ffffc7319029e48d822bf908b1b10303629ed5bf3498