Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d0bdd4b47c7f632…

MALICIOUS

PDF

77.2 KB Created: 2021-03-20 22:14:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72c6cd2f312f5f2ffb76f6ce0c173601 SHA-1: 7db990da3105b336bfa70697c55fe9482edc539e SHA-256: 3d0bdd4b47c7f632814089547bdda884394b3f97c4b7ea1a0c92cc5c6a5b7f2e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary URL, https://pelibifir.ru/123, is likely used to redirect the user to a malicious site. ClamAV and ML classifiers indicate a high probability of malicious content, specifically phishing. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=kepler%2527+s+laws+worksheet+middle+school
    • https://cdn-cms.f-static.net/uploads/4459464/normal_5fe8f82c4a7ac.pdf
    • https://duzamalati.weebly.com/uploads/1/3/5/9/135986709/9a70c800ced00.pdf
    • https://nuzoligul.weebly.com/uploads/1/3/3/9/133997434/borefategig_kufamebam_puxurozevagasuk_mureva.pdf
    • https://cdn-cms.f-static.net/uploads/4415951/normal_6032f25d60fb8.pdf
    • https://nalusopiko.weebly.com/uploads/1/3/3/9/133997408/5375825.pdf
    • https://cdn-cms.f-static.net/uploads/4453108/normal_6010f60fec3f0.pdf
    • https://cdn-cms.f-static.net/uploads/4443823/normal_601601f36b20d.pdf
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/01b15c3.pdf
    • https://cdn-cms.f-static.net/uploads/4461202/normal_60524de84a567.pdf
    • https://rijopadanag.weebly.com/uploads/1/3/1/0/131070137/mavegubamikumap.pdf
    • https://static.s123-cdn-static.com/uploads/4416331/normal_5fe47584447bb.pdf
    • https://nodizolubuta.weebly.com/uploads/1/3/5/2/135297944/6769641.pdf
    • https://fedofiri.weebly.com/uploads/1/3/2/6/132681193/tizovugifusematol.pdf
    • https://cdn-cms.f-static.net/uploads/4407327/normal_600f06baa1631.pdf
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5fd88691bf397.pdf
    • https://zumaraje.weebly.com/uploads/1/3/0/7/130776401/mabaduxukexonudavonu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_5d75d10f11e94bb28fd1dfca547a45a0.pdf?index=true
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_d9c5a3f6021745cfb5f94f819fb66dd1.pdf?index=true
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_bd2f9095e2ee4440a96f555c15031eb6.pdf?index=true
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_9053e64ffe1c4301af89d4fc736c0787.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a6.bin
3e0a2bee00036ee02c7700505cf21c506fc68b906613b1aba4b767f6f1eafed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 5152 bytes
font_01_sfnt_off0000f341.bin
0130a2c2dd015145908a8e21cc871c360bcd2d2b7db3b7fa12ed4bfaf30047f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 10536 bytes
font_02_sfnt_off00011739.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 4324 bytes

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