Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a0c5c1705d29da…

MALICIOUS

PDF

68.6 KB Created: 2021-03-19 08:33:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b2b9f33eec0d9d9fe6742f4eff34f72 SHA-1: 7f7e6840e356b1db83102165c1e37ab30e66810d SHA-256: 28a0c5c1705d29da457fef9571498b4906fbef110a2a86adbf828c952d21f7b4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_LINK_FARM indicates a large number of these links, and one specific URL, https://vilenefex.ru/wix?keyword=daily+common+core+review+answers+6th+grade, is directly associated with the document's apparent content. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature.

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-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://vilenefex.ru/wix?keyword=daily+common+core+review+answers+6th+grade
    • http://copriyghtconfirmed.com/who_is_percy_jackson_love_interestx520g.pdf
    • http://prequester.online/2005_chevy_malibu_headlight_bulb5hxvg.pdf
    • https://cdn-cms.f-static.net/uploads/4423145/normal_602558dde02cd.pdf
    • https://tagopudul.weebly.com/uploads/1/3/5/3/135392217/rofolubako.pdf
    • https://cdn.sqhk.co/kewebogi/ibOhamV/25264331896.pdf
    • https://zovotinaselon.weebly.com/uploads/1/3/4/5/134589175/a6604b32bc473.pdf
    • http://nyvelsets.online/ki_bikini_body_training_guidez28l3.pdf
    • https://cdn.sqhk.co/ramawuvade/enhhbhc/38317195776.pdf
    • https://cdn-cms.f-static.net/uploads/4408195/normal_5fea2685cb604.pdf
    • https://cdn-cms.f-static.net/uploads/4485308/normal_600ad90022c22.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_3b6dfcc5713f4d61bc35e95a171ef77b.pdf?index=true
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_892ce496695c46949446ea99e65f8092.pdf?index=true
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_478db46b078a4f09a7725ba7e8722708.pdf?index=true
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_40e9f00e3a9f4ca88f2dc5232ef5a16a.pdf?index=true
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_d0e1c361b1804d148f1cab4de8b69e74.pdf?index=true
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_2ba28f496662401fad4e607587546f5f.pdf?index=true
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_04646e255c3648e997596003fb188d6a.pdf?index=true
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_471d9d48c6a24381a538caf7986f94ff.pdf?index=true
    • 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_off0000ccbe.bin
f56112b0989a1fee59216684e3fa9ac9d0b330f86d46a820ab73e7592804837e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBE 5760 bytes
font_01_sfnt_off0000e052.bin
0e8ae8981b006cf39d4150d1863e4c7408f16f1fc932f288d211aa4ee03630d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 10364 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.