Malicious PDF — malware analysis report

Static analysis result for SHA-256 5015995e3b22b228…

MALICIOUS

PDF

78.8 KB Created: 2021-09-09 21:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5703eb4a7b58e8a401b20635ec6d35bf SHA-1: c15c303cda5f3855b0c0e6d82be310191174c01b SHA-256: 5015995e3b22b228f17b9899cacf6b4927da0d71f0c039e0d529a06e0a190e77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catherine-massage.com/ckfinder/userfiles/files/15080148138.pdf In PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/54559791534.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/23897559065.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/50569577487.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/69426080030.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/tuwigajutatukubolosa.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/49469082505.pdfIn PDF document text
    • http://winso.tw/userfiles/file/86739166249.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/vosulivatoje.pdfIn PDF document text
    • http://reopen911.info/media/file/83257922694.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/roveti.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/tumuvotevagugobosupu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613072e7c7b78---jatakil.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/89281670058.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/titivurekamokamo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7c4c7bd9---67314100041.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/2996063190.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/mosigalimenil.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/bafowagozekadotojoxu.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/11163169703.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/kenenixutawadonepilofe.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161384e1cd6772---54829952437.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/lipesebivorolo.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/vixokipomipogoposizoxixad.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/jolafakowonupajesoneb.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/88376781792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=yupptv+latest+mod+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_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 17208 bytes
SHA-256: 313e30483e13ce48696e6af9cffedf56f63c2c83afb7c7ba1de2614dbd5545f3
font_02_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 10496 bytes
SHA-256: d7e38fba9ba901063b393119fd8d8bc681e5c61502037cc5691bd8a9206f3f43