Malicious PDF — malware analysis report

Static analysis result for SHA-256 05df38280716b608…

MALICIOUS

PDF

90.9 KB Created: 2021-04-09 10:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b16a09ea2a32c9a27ed6cada56412f2 SHA-1: 867e7a45443bfb2ad50393c47d2fa90d61658b2b SHA-256: 05df38280716b608949f25d0735014f72f95ae8dc1de28d2965b37235cd445d1
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 hosted on various platforms, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://kuzutuzo.ru/strik?utm_term=how+much+acer+laptop+charger+in+philippines, appears to be a lure for users searching for product information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=how+much+acer+laptop+charger+in+philippines
    • https://bovuzujavus.weebly.com/uploads/1/3/5/3/135326818/3092308.pdf
    • https://cdn.sqhk.co/xolofiwano/gjhghRf/vifawejuxel.pdf
    • https://cdn-cms.f-static.net/uploads/4418370/normal_6020a5d8cde4d.pdf
    • https://tofisijola.weebly.com/uploads/1/3/4/8/134863845/kebav.pdf
    • https://cdn.sqhk.co/sunomedude/ghhgihd/risobumiwomeluwadal.pdf
    • https://static.s123-cdn-static.com/uploads/4461525/normal_5ff18d1969126.pdf
    • https://cdn-cms.f-static.net/uploads/4490961/normal_6027e194ca51e.pdf
    • https://cdn-cms.f-static.net/uploads/4421460/normal_604634a4c8537.pdf
    • https://cdn-cms.f-static.net/uploads/4417531/normal_5fe6e94331a87.pdf
    • https://cdn.sqhk.co/lutakakijuro/RhbUhi2/galaxy_battleship_guide.pdf
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/matexogipi_tezajujav_gonilalur_sebume.pdf
    • https://cdn-cms.f-static.net/uploads/4460460/normal_5fd1c749a5576.pdf
    • https://bifitulodagox.weebly.com/uploads/1/3/6/0/136081839/3589332.pdf
    • https://cdn-cms.f-static.net/uploads/4409107/normal_60644fa48ca57.pdf
    • https://cdn.sqhk.co/xawodoze/Hgf6igl/67794885280.pdf
    • https://cdn-cms.f-static.net/uploads/4443803/normal_60262af7293d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_9550dd2d46ea4af09d899fb5b79248b0.pdf?index=true
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_0c5d8ffc65594df78b2720219be37b5c.pdf?index=true
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_c3dc7e9f4d99425cbe1e451151602dce.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a0f.bin
970957fa7088e66274224db25beedc75ba2ae67e35f34f93a11ebd1b7e7b6f32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 5400 bytes
font_01_sfnt_off00011c54.bin
efedd8ef00aa96a5f7849b7510c37b2c72da48e9217792bbb0849c578af95304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 12380 bytes
font_02_sfnt_off000146b7.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146B7 16164 bytes

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