Malicious PDF — malware analysis report

Static analysis result for SHA-256 642eafa93fb75006…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 11:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f67000cec2d4f36e66f49883a43c5130 SHA-1: 1362a8537834f0e9267d8dd70edb71e9f898975c SHA-256: 642eafa93fb75006435bceb4ebe79c5965f01278272622a40a07ecedc8006db2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://digireg.li/upload/72616214555.pdf In PDF document text
    • http://travellerisland.com/files/66519958084.pdfIn PDF document text
    • http://edeins.com/userfiles/file/ruvazoruzufaxiji.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/vigonakizeda.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/sajifinupizepifo.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/18506311754.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/doverixapavufu.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/88874454951.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/8040080121.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/53022281624.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/14189627434.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/rijisuwuvezagireni.pdfIn PDF document text
    • http://timebymtm.com/upload/files/lodegara.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/wugut.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/45693174958.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/bigijeniwake.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/45035801144.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/31364701802.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/kuwas.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f003024ace---80747408719.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/53249899666.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/7180643840.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/bamowiwibekudu.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/33258149069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+can+you+make+with+a+mundane+potionPDF 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_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 10852 bytes
SHA-256: eec75a67478649c223c6cf7015e2fcc7512e93abd4f8fcba61b2a6c6b84615a6
font_01_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 17232 bytes
SHA-256: 4ab080dd4e8ce5ee9d8a8a82b223204b14403b05734d760a9cc5c49407d5e741
font_02_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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