Malicious PDF — malware analysis report

Static analysis result for SHA-256 824bec98573d71bb…

MALICIOUS

PDF

84.5 KB Created: 2021-01-03 06:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 911a9275a78140ac9b9866b605fb1fec SHA-1: c0638630954301a80abb36a0418a5308414f599b SHA-256: 824bec98573d71bb937b31d2e86692cebbed2e0da775c2fabbab7226bc5b2978
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs point to various PDF files hosted on different domains, which could be used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://traffine.ru/123?utm_term=nanatsu+no+taizai+imashime+no+fukkatsu+season+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386333/normal_5fe99350d1028.pdfIn PDF document text
    • https://cdn.sqhk.co/wewidipo/gcz3ghd/granny_legend_hero_mod_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5f970b17d0a1e.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/sozufo.pdfIn PDF document text
    • https://tusukufuduma.weebly.com/uploads/1/3/4/4/134458322/toxonixopananix.pdfIn PDF document text
    • https://jezagegilefu.weebly.com/uploads/1/3/4/3/134307882/184434.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5fc753b57d1f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388620/normal_5fa4cba3864d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487918/normal_5fc52523de9d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_5fa529ce59fbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387581/normal_5fc999215a40f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 2940 bytes
SHA-256: 45ea1bed5576a1977ce39a4c57f9feb57e4aaf4566a86d1c692d92643b304b4e
font_01_sfnt_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 5096 bytes
SHA-256: c8a9eaead4fdfc90a58490b96e44238490ba1708e17fa7910c8c9a38ff56b32a
font_02_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 2316 bytes
SHA-256: 1f4ab3dc7109b145c55e010206da44dc5b766b523135897298ed1d8498437569
font_03_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 13432 bytes
SHA-256: db72252c46bde1f61f18a56aa2742e95ebc334dc6e26f23517104bf34226480e
font_04_sfnt_off00012b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 16376 bytes
SHA-256: 6762922329e74f51014e32005eac82fb41ab38654196719033a82d702710126e

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