Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79d82ec637558cb…

MALICIOUS

PDF

70.9 KB Created: 2021-09-13 12:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86e05b51eeb9e05484961387a60be58f SHA-1: 499ed1c75b1e16610d230533caa76e2a7c6255d0 SHA-256: e79d82ec637558cbe7c9c151843c8344d0dd53bce6be6ecfe04fc1ae40def7e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically pointing to 'irlanc.ru' and containing a UTM term suggesting a download lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and the nature of the external links suggest the PDF is used to redirect users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=download+game+apk+data+mod PDF link annotation
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6340fc97cd713790dfeb1f4075c137a8/kutuxiwivob.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/vodorafovapugizuguxute.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/76591824081.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/demalatezatolima.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/16995566506.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/wolukob.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/98333773098.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/43643788821.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/jusotofatugum.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631293484.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/zusojomoninogumamif.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/39966085887.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/49376449137.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/12116290281.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/8027642583.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161387469a5d85---32756309201.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/94259634818.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/60306168943.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210908144416.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kirarane.pdfIn PDF document text
    • https://akconta.com/uploads/files/3866403763.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/vonajozuzefixogavomix.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/kumerepovatawanino.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/688649219.pdfIn PDF document text
    • 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_off0000b610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 10552 bytes
SHA-256: 0f83b619c37b38aa412d397817eb563e2cfaef18d4ae7db567022ffa19f78cd1
font_02_sfnt_off0000e605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 15648 bytes
SHA-256: 8e9cc81f0c0b485e1b504c781f1853c7c16fa6102edabaf73450e5c08ee3eec3