Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c51c4f000278d8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 20:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a0fe1e49e32132772f97d261baa9eac SHA-1: 0791572c81f478ae9cab06c04994de067e6c60cd SHA-256: 32c51c4f000278d818709ba0d251db93710e68c3e77bc36ed61956f8614b39e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the presence of many external URIs points to a redirection or download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.mezmat.ru/ckfinder/userfiles/files/30881461638.pdf In PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/35563019890.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/bibepijekumuwikudugudaxoj.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/divotorobatezasumud.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/losesusirujufagipopew.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/nediwigitilibuluketu.pdfIn PDF document text
    • https://eurotig.ro/file/latijowiwigafav.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/75461237652.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/86726075464.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ef23e5fc7---60761112450.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4567efb51---fexavewoduzebim.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/gisujulitiwisoj.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210909_6B73D47291347879.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/besonudekanejalaj.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210909140017.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/75536796315.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/xiravawo.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/38722909284.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/63258414906.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/18159838817.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/94839902928.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/xedudumenukoduwu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/kozutegelojajegedogot.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/59459219463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+users+in+usaPDF 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_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 18040 bytes
SHA-256: eecc47f8eb6ae65ac3882b5a1273a0d68f2570d1d5b2fc474bf6647a449600c3
font_01_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 10180 bytes
SHA-256: 6e419096d0eb6d020f4c0544a5e0f991bb3696ee0efa1a90f396edfdc7641014

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