Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0870962d7103d1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 17:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 530326fde8cdc19fc797f9a536bb8a92 SHA-1: a13f40c64bd39053eb6c5f67b75f69f3dbedbce0 SHA-256: 9a0870962d7103d1652c250f320477b72b85a993d0caf0e3803ca810e2454b86
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

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.
  • 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.
  • 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://hogozaty.com/ckfinder/userfiles/files/tidukerugisufomoken.pdf In PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37890521500.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/21883046683.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/fevijaneduv.pdfIn PDF document text
    • https://alev.az/userfiles/file/17827365787.pdfIn PDF document text
    • https://servauto.fr/img/user/file/wexinebogixapoge.pdfIn PDF document text
    • http://yejida.com/userfiles/file/38763425207.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210908055045.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/bijezupibijipukogodokama.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/kinetora.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/fejexekajanoxezasaxidi.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/74155016752.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/16179208286.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/55772444451.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/zerejib.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/gelopuxodamumitoxuge.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/9899631719.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161443dbe5fdf6---23038377244.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/92312443125.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/vekomudojekon.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/21225769870.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/pebekesodaxezixikova.pdfIn PDF document text
    • http://grandfiltr.com/files/file/93959317201.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/pefak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=toca+life+apk+unlockedPDF 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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 10400 bytes
SHA-256: 5a06be81d4b70ddc8877b787c0dcc5dc6cbbe0647897ebacb6c017d15494c636
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 16856 bytes
SHA-256: bc64e8efd120a02c429e2b8422991f4f47196dca35c71d3c02dead5bc32eff83
font_02_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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