Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6442174a6f145a…

MALICIOUS

PDF

91.4 KB Created: 2021-06-09 01:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 526d19122bc7fa1224fe3d87a9a35822 SHA-1: 773106f138c08af28ec5c9af6f805707df51c802 SHA-256: 3c6442174a6f145acc7ab7c026058e516754ab5a113113b0eab662249c615a8b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other file-hosting services, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/123?utm_term=emotional+intelligence+worksheets+for+adults+pdf
    • https://wulakajif.weebly.com/uploads/1/3/2/7/132740593/2629984.pdf
    • https://cdn-cms.f-static.net/uploads/4468530/normal_604cb8e387c0f.pdf
    • https://cdn-cms.f-static.net/uploads/4491173/normal_60bfeb74692eb.pdf
    • https://cdn-cms.f-static.net/uploads/4379733/normal_60bef17b3befe.pdf
    • https://cdn-cms.f-static.net/uploads/4489596/normal_5fd60cb947f42.pdf
    • https://kebumemimax.weebly.com/uploads/1/3/1/6/131636814/5760831.pdf
    • https://static.s123-cdn-static-d.com/uploads/4476436/normal_60b35ac3bf40b.pdf
    • https://cdn-cms.f-static.net/uploads/4372682/normal_606931887b611.pdf
    • https://cdn-cms.f-static.net/uploads/4413982/normal_602bfa282929b.pdf
    • https://pajarozexukonom.weebly.com/uploads/1/3/1/4/131437235/vevokuz.pdf
    • https://cdn-cms.f-static.net/uploads/4485810/normal_606ea29f630ca.pdf
    • https://cdn-cms.f-static.net/uploads/4415052/normal_5fd779cec8727.pdf
    • https://jubolovewo.weebly.com/uploads/1/3/1/4/131453214/2409ba13c5458.pdf
    • https://static.s123-cdn-static.com/uploads/4412900/normal_6006a21b0d3ea.pdf
    • https://cdn-cms.f-static.net/uploads/4379234/normal_6040bac11e50b.pdf
    • https://jatuxifukonexe.weebly.com/uploads/1/3/4/4/134469885/7850473.pdf
    • https://cdn-cms.f-static.net/uploads/4445341/normal_6048d56a4056c.pdf
    • https://cdn-cms.f-static.net/uploads/4368997/normal_60272f5d0ca94.pdf
    • https://cdn-cms.f-static.net/uploads/4382619/normal_6065f8623c243.pdf
    • https://static.s123-cdn-static.com/uploads/4485807/normal_5fe54b52e7856.pdf
    • https://cdn-cms.f-static.net/uploads/4387816/normal_605c426368381.pdf
    • https://cdn-cms.f-static.net/uploads/4420470/normal_606977ba6fb82.pdf
    • https://cdn-cms.f-static.net/uploads/4460060/normal_5fd219c9daa1f.pdf
    • https://static.s123-cdn-static.com/uploads/4413373/normal_5ffbaed19353f.pdf
    • https://dawikuwavuvuka.weebly.com/uploads/1/3/4/8/134866752/3843979.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0001242c.bin
5205a7c7bfaabb4aa25aeb534cc39bf3fa81d7000665864c8a86d882d04381dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 5680 bytes
font_01_sfnt_off00013773.bin
393780e133bdb71cfed3dd517d48d20f47522be86101aa6ed69175c45d5a8ab2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13773 11172 bytes