Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb87e0cbdccd368c…

MALICIOUS

PDF

77.9 KB Created: 2021-09-23 18:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0c505ae17ecb9e2604ba95482f4117f SHA-1: bf370512fb978b96110fb142b95a5c7516a24170 SHA-256: eb87e0cbdccd368c5cef0693b9ec1921a82d2fb552a5299d5e4b42f3cc642aaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrustworthy domains. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=oet+20+writing+samples+for+nurses+pdf PDF link annotation
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/gobesito.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/52139693392.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5442f9cf9877f09a186b2b40362ce3d7/51901801459.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/10605212059.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/ludetenobadikobo.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/75201952192.pdfIn PDF document text
    • http://voijin.com/userfiles/files/jafakejegavufojawem.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/xenekibosexujazutoze.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/83730808682.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/fidoluvegofabedelo.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/titexowukerijibowube.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/lobiputedewel.pdfIn PDF document text
    • http://ceroki.com/image/files/87682240560.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/nexiboxuzolusawi.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/botaxuxudisovukodeduwod.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142341caa6d5---44785319651.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/lizadumerewodaloro.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/ritanogadisujemoba.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/tuzimatozetofixisaw.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/newuvuzadisimek.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/36225978959.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/44571412221.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_off0000c879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 18416 bytes
SHA-256: 4f9b20dbb19a9ffca8dd385cfd8712c77d24611ea9ff8224cbe7ee40901a3c03
font_02_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 11292 bytes
SHA-256: 0defab076213d5492d84c3c76bf7c190da5aa3d02d98c87b6d10cbd7f61a57d3

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