Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f109a815710bd59…

MALICIOUS

PDF

77.8 KB Created: 2021-05-21 05:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cad3932851593f7df5782819fffb19b3 SHA-1: d4242c8ed93ff33e55017e0d547744d2ef72c27d SHA-256: 3f109a815710bd5933216b4958a8c9d5fb7be3b64d02652b419a8bdbe62f7768
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to Weebly subdomains, suggesting a link farm or distribution network for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URIs and the overall structure point towards an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=birth+certificate+form+pdf+download+jharkhand
    • https://zamamuxito.weebly.com/uploads/1/3/4/2/134234866/rexatukumirame_bewivosivewup_gazopupo.pdf
    • https://cdn-cms.f-static.net/uploads/4380084/normal_601424b1c4c72.pdf
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/105127.pdf
    • https://kafaxidaduxeb.weebly.com/uploads/1/3/1/4/131438036/269566.pdf
    • https://cdn-cms.f-static.net/uploads/4388612/normal_60437d0b342a2.pdf
    • https://cdn-cms.f-static.net/uploads/4416919/normal_601d20ffc18f0.pdf
    • https://cdn-cms.f-static.net/uploads/4388065/normal_605279f600bb0.pdf
    • https://votorivoxezi.weebly.com/uploads/1/3/4/0/134095847/6fefc853c08.pdf
    • https://zugasemoz.weebly.com/uploads/1/3/4/5/134593751/46860b739e33854.pdf
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/c53341.pdf
    • https://wozomeki.weebly.com/uploads/1/3/0/7/130776066/d028fe07536b.pdf
    • https://xepozumer.weebly.com/uploads/1/3/1/3/131380160/05942dd5216eed0.pdf
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/7137c62aae01d.pdf
    • https://fumuradowije.weebly.com/uploads/1/3/0/7/130739974/kuruz.pdf
    • https://vegonivi.weebly.com/uploads/1/3/5/9/135986737/karemuvadudumenoj.pdf
    • https://static.s123-cdn-static.com/uploads/4450721/normal_5fcf74ba2bee1.pdf
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5ff7c9f28c106.pdf
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/5810148.pdf
    • https://cdn-cms.f-static.net/uploads/4421341/normal_5fd7156d1a9f7.pdf
    • https://somigoduwus.weebly.com/uploads/1/3/4/4/134470899/9973870.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazawojob/burglary_insurance_policy.pdf
    • https://s3.amazonaws.com/sitozi/maplestory_m_evan_leveling_guide.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26b.bin
cf4496656f997ac8ee85f46fa681e8541084faa3c263abbc146fe3e052fd3d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 5500 bytes
font_01_sfnt_off0001050b.bin
8e0a6d77f588c0b2fdd8ca25de2bdd75edad41cc7f0a742c7bdcfc2e66bd602f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 10596 bytes

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