Malicious PDF — malware analysis report

Static analysis result for SHA-256 f430de7c9705e58f…

MALICIOUS

PDF

75.6 KB Created: 2021-06-08 07:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4d7f01991dea8b2b7c57ffbda5a6f597 SHA-1: ca63e17b6ab48375d2ecc655a7a937d82ec4d0b5 SHA-256: f430de7c9705e58f2305e0256ce242633fc2d43041ab24c07106831368baba3e
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a suspicious domain. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link-farming or redirection scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • 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://mezovuduw.ru/123?utm_term=bending+moment+experiment+report+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465145/normal_605324bb549c9.pdfIn PDF document text
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/verazimata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383334/normal_60000db91d4d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456166/normal_5fe3f5ceb1019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385859/normal_5fdd713fa739a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449768/normal_5fc810048eff1.pdfIn PDF document text
    • https://vimuzepujox.weebly.com/uploads/1/3/4/3/134368191/9e59da1.pdfIn PDF document text
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/9422716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450338/normal_604192763d767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_6061398185bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479923/normal_601347b107939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_604d2073791b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466161/normal_6055b7117b359.pdfIn PDF document text
    • https://midejewafefo.weebly.com/uploads/1/3/4/0/134000268/4946301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_60be9244db852.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489244/normal_5fc890302099c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481999/normal_6001a990957c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedetuwi.pbworks.com/f/fexopo.pdfIn PDF document text
    • http://namikikis.pbworks.com/f/what_is_auto_reply_message_in_whatsapp.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/face_app_premium_apkpure.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/f/83497694025.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/f/subunogepilawikivoresav.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/f/69762398152.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 5056 bytes
SHA-256: 84a3d639c6a2cbdf57443a16adfe6da15b69942257a3d36b5bc7b483ffb01138
font_01_sfnt_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 10356 bytes
SHA-256: ce86e8cc8bf0f6ae23924ca1ee32d092594088c1781bb996a1e9ca0583763794

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