Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d308702f77c229…

MALICIOUS

PDF

67.9 KB Created: 2020-11-18 06:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f24ce0babf89748ff5392e46acbe9ab8 SHA-1: 17d96d0809e540401357d2b72bb9e524ec021ec7 SHA-256: f8d308702f77c229dcecc8d3a964fbd836e6ee56e99860dd714a948c0f0c58e8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and numerous URLs suggest a link-farming or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=ham+loaf+recipe+amish In PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_5fad254267eca.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/2f8ca042a26b.pdfIn PDF document text
    • https://tofejigijo.weebly.com/uploads/1/3/4/3/134312142/gagokodofubezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f98ce0988bd2.pdfIn PDF document text
    • https://biwefixosepow.weebly.com/uploads/1/3/4/3/134334309/8145434.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/3343981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421213/normal_5fa902141ffbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f87055dbc5a7.pdfIn PDF document text
    • https://zexivuwesime.weebly.com/uploads/1/3/4/3/134356920/miraxemizawetim-vegetutododu.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/6842238.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zasepo/xapedaroguf.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/97051373890.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/xakudepam.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/hotel_formule_1_villeneuve_le_roi_orly.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/blankets_craig_thompson_free.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_off0000cdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC8 5216 bytes
SHA-256: 4ece1ed8b238aa2bd2faa7075d0a5e99621d81010cd01e707d70d7d77f7f795e
font_01_sfnt_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 10424 bytes
SHA-256: 527e03327d994f7c63c9abf243cb3a881101ea71de0038907b898955b2cf8372

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