Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e9049eef210c6f…

MALICIOUS

PDF

73.3 KB Created: 2021-06-12 08:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b7943fdfa1d6479ed3cacfe643ef2b26 SHA-1: 3d57b6e3fd802d725a7a03bc1ca15f66be4968d2 SHA-256: e7e9049eef210c6f709fc09e9d006951da8f925021af05cfe8b6219461d54d0d
186 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 disposable hosting services, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute malware or phishing content through these links. No scripts were extracted, but the presence of numerous URLs and the heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://philabc.ru/pbw?utm_term=letter+a+worksheet+preschool PDF link annotation
    • https://nafeziwubiwodi.weebly.com/uploads/1/3/1/3/131379183/zuniziwaf-zupepos-tevalij-tapekasolezafa.pdfIn PDF document text
    • https://vasukoxenubepez.weebly.com/uploads/1/3/4/4/134475355/781e30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_60465c053fb5d.pdfIn PDF document text
    • https://bojumojomugo.weebly.com/uploads/1/3/4/8/134850871/a73ac5057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_601403c42fc72.pdfIn PDF document text
    • https://purubagenipobeb.weebly.com/uploads/1/3/1/3/131398544/buxafenurobare_fativolupu_wisuzemuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_6063cf5edd195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_600c5f6e22b0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_6032483515953.pdfIn PDF document text
    • https://nuxutesinof.weebly.com/uploads/1/3/1/4/131437012/1118333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_60b8b46d863af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475376/normal_602f2aa7ef0dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_60147da2d2505.pdfIn PDF document text
    • https://legopaxazomunan.weebly.com/uploads/1/3/5/3/135396831/titemevozekeloruzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426257/normal_601813ee82995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_60c2abd8d0c47.pdfIn PDF document text
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/fosegenijag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5ffe73ef14f81.pdfIn PDF document text
    • https://kabixiwuvilaz.weebly.com/uploads/1/3/2/6/132681231/vadewesusefu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liguduper.pbworks.com/f/vizubokiw.pdfIn PDF document text
    • http://sojakun.pbworks.com/f/49300995696.pdfIn PDF document text
    • http://dobifapig.pbworks.com/f/toomics_hack_mod_apk_1.3.3.pdfIn 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_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 5116 bytes
SHA-256: 36727f456bbc6c63dbbcd3a2f2f298cd6f69e2624e1bd2df6547db47356c0cab
font_01_sfnt_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 10832 bytes
SHA-256: a3fec4204d587485d04de7436eaaffdfed0cc3a91cc3d5d6336c27da94bdd56a