Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55a2de9b39fecff…

MALICIOUS

PDF

88.5 KB Created: 2021-03-30 20:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f20e30e29e2e72a61f13eb21b4cb128e SHA-1: 9f50bf6407dbcb8d2b781236d0fe89e0de5b7853 SHA-256: d55a2de9b39fecffa4a41e4c13ce2679c657b4d2c44a32444c22159e5e6061dc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, and detected by ClamAV as Pdf.Phishing.Trojan. The presence of numerous external links, including one pointing to 'xezojetit.ru', suggests a phishing or link-farming attack. The document body, though heavily obfuscated, contains metadata related to PDF generation, indicating it's not a legitimate document.

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-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://xezojetit.ru/wix?keyword=all+my+sons+arthur+miller+summary+pdf
    • https://static.s123-cdn-static.com/uploads/4447630/normal_5ff695e6271fa.pdf
    • https://static.s123-cdn-static.com/uploads/4468812/normal_5ff683906f50c.pdf
    • https://cdn-cms.f-static.net/uploads/4387825/normal_5fd30039ded16.pdf
    • https://vekowafonomi.weebly.com/uploads/1/3/4/6/134692424/1835217.pdf
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5ff31b2c150ed.pdf
    • https://cdn-cms.f-static.net/uploads/4469849/normal_6025b0c3edc64.pdf
    • https://bupedokan.weebly.com/uploads/1/3/1/6/131607930/fotozenusam_jilefefogimoxu_ratipuju.pdf
    • https://cdn-cms.f-static.net/uploads/4388818/normal_6023a0259c98d.pdf
    • https://cdn-cms.f-static.net/uploads/4387826/normal_6035617de4fa8.pdf
    • https://cdn-cms.f-static.net/uploads/4379605/normal_5fea381fcd3d7.pdf
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/zexesuwitusixi-zilipino.pdf
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5ffe8c4f2c912.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8a770ea9-cd84-4218-a60f-9b826ac4b35c/cuando_se_podra_viajar_a_eeuu.pdf
    • http://laxuzoto.onlinewebshop.net/buxejuwaxafokexipivajaw.pdf
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_817600a957bd4da8b966172983868e0c.pdf?index=true
    • https://e2874035-7c54-48a8-8322-944b307ffed0.filesusr.com/ugd/3283b0_278d573a9d8841db814073f310f81077.pdf?index=true
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_540ae6ee6ce649068e744dcb9ec86c61.pdf?index=true
    • http://jaminuzifibe.onlinewebshop.net/nolanamonadukudowogamuj.pdf
    • https://uploads.strikinglycdn.com/files/5aba8fc2-0dd4-4974-9be5-39fa70bb3fd7/8447643441.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_off00011c0a.bin
c9fbd8de1a4952867cda31de216d943a77902b8260f5f92bec3c2d1d120e9362		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 5372 bytes
font_01_sfnt_off00012e2b.bin
5dfbd5169b766322454b9173adf7b18f7926c49516c63f0704b8dad03e7ed4c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2B 11672 bytes

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