Malicious PDF — malware analysis report

Static analysis result for SHA-256 b975778d7e8cada8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 03:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e990c74531fc2e273748154dfeceb5b SHA-1: fadcf5f3b67541923e0c4151a6bdf908664d5ce8 SHA-256: b975778d7e8cada8a4fe29b2719edef9fac6f3c5e7f27949d4698fc62dcb9925
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF contains numerous links to external websites, with one heuristic specifically flagging it as a 'link farm on disposable hosting'. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://trubaopt.ru/content/file/mizowekojawuwuvimu.pdf In PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/kuzikiwozubolebusuv.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/69275802301.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/lufave.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/96031183699.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/fusubibabawitovago.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/menov.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/pekogilinigogupovukamebu.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/62139059382.pdfIn PDF document text
    • http://mq-water.net/upload/pupexudizepubumu.pdfIn PDF document text
    • https://baptistfriends.org/media/34037526323.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/57145897898.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/bipofowaronujinusolufik.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/kulerekevozux.pdfIn PDF document text
    • http://crm333.com/documentos/file/99122425066.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/37219679014.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/36412204434.pdfIn PDF document text
    • http://mfcpavpos.ru/file/38610377645.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/76201593836.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/duduwotosusajaf.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/jutuzisudarojanexamen.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/49655355929.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/20441245927.pdfIn PDF document text
    • http://airzo.net/userData/board/file/nozuzudipuw.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/fugigurovuxotijavejeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=qr+code+firebasePDF 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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 18000 bytes
SHA-256: 2d0e78a1add839adeadb805505df25bea2f9e179328d45278ccfb5edac06e131
font_01_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 10420 bytes
SHA-256: 096393c15f4cfe096a273aa3f45abae35e846bfbf7ebb623ad582d75752b1b9f
font_02_sfnt_off00012488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1