Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c3f3ac8374b5cb…

MALICIOUS

PDF

67.4 KB Created: 2021-09-12 14:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 7214ba566389be13d709b639d25992f6 SHA-1: cad135a5957e2ad1eb6dc3e6c060d483e209e207 SHA-256: e0c3f3ac8374b5cbfb6fcce6be02469b57e3fcd5c60ae7530f7b96c5777dfe8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://kxqcgs.net/filespath/files/20210910023043.pdf In PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/soxafurunatipun.pdfIn PDF document text
    • http://espwireless.net/uploads/file/rorunivukunurib.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/sivafisojatafog.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/lifoxowatiwavi.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/durenu.pdfIn PDF document text
    • http://retailcop.ca/files/mobiwo.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/77934530227.pdfIn PDF document text
    • http://laserinnsbruck.com/static/wibemevidenumenunuje.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ade9f474e6---69064235711.pdfIn PDF document text
    • http://js-space.de/userfiles/file/lobibizijofixogex.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/3760441683.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/wijafawazitekefezajov.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/98095736151.pdfIn PDF document text
    • http://mayjack.com/upload/files/4912356957.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/49857537900.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/noxaxom.pdfIn PDF document text
    • http://showdoimovel.com/files/files/taloganorinavirujopa.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109040604215902.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/77695360288.pdfIn PDF document text
    • https://grouptm2.com/contents/files/kuzolaw.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/8731039136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=batman+rises+apkPDF 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_off0000acb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C9 14896 bytes
SHA-256: 2f08d300932055cef052dd5a67e27d80dd2b54b3f5c9b945daeec18c226b60a5
font_02_sfnt_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 10392 bytes
SHA-256: 7b5bfb51b1bbe4b5b20fc36929bc0fefdd09e56f0f110def06408fa8103517c1

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