Malicious PDF — malware analysis report

Static analysis result for SHA-256 17486da01f752adb…

MALICIOUS

PDF

86.4 KB Created: 2021-06-05 11:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c712c656ac4d8eeb565b346c52e3399 SHA-1: 84cafbaec81bd3380b2e76c6d5610f8eb611f846 SHA-256: 17486da01f752adb78baf74e18dec5449f36946a4bddac87476d4117e8025298
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic suggest the document is designed to trick users into clicking malicious links, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pixomot.ru/wb?keyword=5th%20grade%20area%20and%20perimeter%20worksheets%20grade%205
    • https://static.s123-cdn-static.com/uploads/4385235/normal_5feda187206f1.pdf
    • https://static.s123-cdn-static-d.com/uploads/4423452/normal_60b490e06864f.pdf
    • https://dumiwezabofovo.weebly.com/uploads/1/3/4/7/134743005/f0794698b.pdf
    • https://static.s123-cdn-static.com/uploads/4371509/normal_5ffb7bd4a07ca.pdf
    • https://pogugabumivo.weebly.com/uploads/1/3/1/3/131381840/kogebemaxosoberi.pdf
    • https://cdn-cms.f-static.net/uploads/4370309/normal_604222ece1ab0.pdf
    • https://cdn-cms.f-static.net/uploads/4450147/normal_604cd9df101fd.pdf
    • https://daguvosiliwu.weebly.com/uploads/1/3/1/4/131406153/velezosawafa.pdf
    • https://dugesovexu.weebly.com/uploads/1/3/5/3/135321213/narirasixur.pdf
    • https://cdn-cms.f-static.net/uploads/4457014/normal_600a1b41cf62d.pdf
    • https://static.s123-cdn-static-d.com/uploads/4387922/normal_60b581e3e0f50.pdf
    • https://jitoxazenop.weebly.com/uploads/1/3/4/5/134588357/gosewedawetek_nuwimi.pdf
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/muxirinoguzezes_mafuj_wosurexilizunib.pdf
    • https://cdn-cms.f-static.net/uploads/4469634/normal_6032c45d91e46.pdf
    • https://garururukipu.weebly.com/uploads/1/3/4/2/134235121/xuxawijomamufolit.pdf
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/07e0864ef6b.pdf
    • https://japifopegukev.weebly.com/uploads/1/3/5/9/135975580/pusax.pdf
    • https://pezibufanijazox.weebly.com/uploads/1/3/4/6/134639202/6515115.pdf
    • https://cdn-cms.f-static.net/uploads/4403557/normal_60386a4f3921e.pdf
    • https://cdn-cms.f-static.net/uploads/4417119/normal_605ca0c08d161.pdf
    • https://cdn-cms.f-static.net/uploads/4379736/normal_60111a91210cc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011148.bin
87d94e89b89492924a48419b13b866a93a880d704a1130882deccd4f9061a4a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 5528 bytes
font_01_sfnt_off000123f7.bin
258a5b42481e2c19f3467b52eb18c86d12dbdbba3c844ceb9599d7b1cfef480b
pdf-font-stream PDF embedded font (sfnt) at offset 0x123F7 11844 bytes