Malicious PDF — malware analysis report

Static analysis result for SHA-256 40583213495bfbe0…

MALICIOUS

PDF

80.1 KB Created: 2021-02-18 13:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 7ed9f323b7d20bd9891ed71e872a34d4 SHA-1: f977a1fe55a8dd50f951a0e875ff6d8f8a9382a7 SHA-256: 40583213495bfbe01534acb504e2dc27ca9004806423f2cce4d5d0ef03292054
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content.

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
  • 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://maypoin.ru/wix?keyword=me+pearson+library PDF link annotation
    • http://mybestchan.online/aggiungere_stickers_a_whatsapp04pbt.pdfIn PDF document text
    • https://cdn.sqhk.co/gifidupuzuv/i91iCik/98958147709.pdfIn PDF document text
    • http://info-pages.ru/xenixugipozukurutonefw84we.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/BOhiPhj/final_fighter_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_600fc1f7c7e77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376610/normal_6008cee5795b1.pdfIn PDF document text
    • https://cdn.sqhk.co/lewemimi/jdmCIhj/walibomitisefezawu.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/idjf5uw/fulavep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5ff251ee28fb4.pdfIn PDF document text
    • https://gopadafuwidu.weebly.com/uploads/1/3/0/7/130740623/vatozagefebapum-jugofujipelom-medufema.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488556/normal_60099d9d691ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496146/normal_5ff133225940a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445325/normal_5feed20c1dad0.pdfIn PDF document text
    • http://tradestaroffice.com/dictionary_english_into_urdu299hy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402294/normal_60012f91c957d.pdfIn PDF document text
    • http://osmosiotzs.fun/mereradeburunujemq46z.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/epVI3ie/lowefukeluxutidamozub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 5060 bytes
SHA-256: 2b6045370904efd0cd6f1a8abb1073a6ad74de98f8dc1f009b47514e9a37acac
font_01_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 11796 bytes
SHA-256: 036466cd7eaf39dfd43bfccf9e2ac5453eafc3e0c5423b6bfce988007dd24250

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