Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c95ecc60331713…

MALICIOUS

PDF

71.8 KB Created: 2021-05-27 09:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5e2f038011e1b2c962e8a60acbe28c8 SHA-1: 275b3e1895dc0ec5f3da66a363734c69329b4cb8 SHA-256: 11c95ecc60331713c1f4cdaa0565b31dabe9fb6ba54034022790bd771c962f6f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, a technique often used to create link farms for SEO manipulation or to direct users to malicious sites. The primary external URL observed is https://zajinet.ru/strik?utm_term=paroles+de+chansons+nous+dormirons+ensemble, which likely serves as a landing page for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://zajinet.ru/strik?utm_term=paroles+de+chansons+nous+dormirons+ensemble
    • https://static.s123-cdn-static.com/uploads/4455658/normal_5feea3c75adc7.pdf
    • https://felelitujafi.weebly.com/uploads/1/3/5/3/135392562/tinupumojoru.pdf
    • https://cdn-cms.f-static.net/uploads/4480756/normal_60175cc4746c0.pdf
    • https://botekajerojaj.weebly.com/uploads/1/3/4/7/134749353/9a80c5a4b.pdf
    • https://cdn-cms.f-static.net/uploads/4380543/normal_602cb35be0404.pdf
    • https://cdn-cms.f-static.net/uploads/4418362/normal_6009d9a23a0a0.pdf
    • https://static.s123-cdn-static.com/uploads/4470696/normal_5fe37b80bb303.pdf
    • https://kefuvarunif.weebly.com/uploads/1/3/0/7/130739830/nuluvaxevipugubuna.pdf
    • https://cdn-cms.f-static.net/uploads/4463287/normal_606e62c52fcf0.pdf
    • https://nuxinipimop.weebly.com/uploads/1/3/2/6/132682773/lerixabemo.pdf
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5ff656289e936.pdf
    • https://cdn-cms.f-static.net/uploads/4467019/normal_60608b6ed9a3d.pdf
    • https://cdn-cms.f-static.net/uploads/4393486/normal_6009f5332c587.pdf
    • https://static.s123-cdn-static.com/uploads/4407988/normal_5fe50761b9fd7.pdf
    • https://cdn-cms.f-static.net/uploads/4479454/normal_6039a9510dbae.pdf
    • https://static.s123-cdn-static.com/uploads/4420244/normal_5fc9a1d3b4b5a.pdf
    • https://static.s123-cdn-static.com/uploads/4425230/normal_5feec8df98b6f.pdf
    • https://cdn-cms.f-static.net/uploads/4501367/normal_60313bd32b68c.pdf
    • https://fawirato.weebly.com/uploads/1/3/5/3/135392883/luzejofuv.pdf
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/8581148.pdf
    • https://lesakotuvolev.weebly.com/uploads/1/3/7/5/137505649/6d6a7867e4f.pdf
    • https://wudujadulaneg.weebly.com/uploads/1/3/0/7/130738887/9086960.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b7210590-8ab7-47fc-a153-62e87d2ab310/69420919913.pdf
    • https://uploads.strikinglycdn.com/files/f4b57cda-4c0f-45cf-bada-8388b1a7b39d/petsafe_in_ground_fence_collar.pdf
    • https://uploads.strikinglycdn.com/files/387ceaa5-99f3-4347-8281-86a7f56f3066/97204716520.pdf
    • https://uploads.strikinglycdn.com/files/82b9f4e9-8609-452b-bc0a-cea7b23a6e5b/is_the_witcher_coming_back_for_another_season.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_off0000dc43.bin
de2c1220a443cfa300af451617d3b6a8ecb9f856330acad6584326d54f567c1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 5320 bytes
font_01_sfnt_off0000ee29.bin
4b5d1f24056910a1a6291a27227776c15c3bc568f447f724701e2e9d51e6d021
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 10888 bytes