Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6befcd01a5cf58…

MALICIOUS

PDF

76.0 KB Created: 2021-09-09 22:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca5b20af402472b5c879b2f1d46da653 SHA-1: 3e304f738250866119117728048f5dc29fce1192 SHA-256: 7f6befcd01a5cf582f3b3676f246a19790b923d276da340cabb8e0c425796026
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic firings point to the document acting as a link farm, with numerous external URIs leading to potentially harmful content. The presence of embedded URLs suggests an attempt to redirect users to malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=android+apktool+tutorial PDF link annotation
    • https://accounting789.com/ThImg/file/sejidelil.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139dac84e945---tolobuwidawariwesodaz.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/dixizojonizusesabetibasa.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/fimekosumamamaxevanuva.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/fularadewukakuwepo.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/21417713498.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139445ea1bbb---69323842623.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/gekekato.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/40014403981.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/misokojevunubodatugivid.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_053012.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/vugozomuzepizine.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/mirugovoroladonilomos.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/nurufovodusajezifi.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/55669889043.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/87773444513.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/bobaxaniritaxuxewanaru.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/matorutixoduxizivogu.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/25549537106.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/1738357964.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/43170411056.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/17892507652.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_off0000c6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BC 17052 bytes
SHA-256: 34c203b4ded744ad19f576646664c13c3f258fc1de77b810b70f1b90a5ef0fd4
font_01_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 10260 bytes
SHA-256: 51810096b1ba9e896e4367e5a9ba0ac24c9ad658bd59dd6ce19bdaff50adeb00

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