Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb24f7e70aea8a9…

MALICIOUS

PDF

88.0 KB Created: 2021-03-24 03:28:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 287daf583c96aba6d5d8926023cb9eca SHA-1: 005390c90338a3c923f403435471e6034ad56358 SHA-256: 5bb24f7e70aea8a9808f0673eda8e29995848575db68cebb73354e992c9769c8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a potential phishing lure related to educational content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=graphing+irrational+numbers+on+a+number+line+worksheet
    • http://copyright-security-ig.com/alien_shooter_td_cheats11vb8.pdf
    • https://cdn.sqhk.co/judawube/Ogcjfja/automotive_engine_diagnostic_tools.pdf
    • https://cdn.sqhk.co/wubunepan/mhjgfhg/dojakovefebefijaj.pdf
    • https://cdn.sqhk.co/kewusikata/wghGgdr/nusufajadubuziwelikokined.pdf
    • http://loxokunetuladi.66ghz.com/harry_potter_y_la_orden_del_fenix_libro.pdf
    • http://shoop-fe.ru/reflexive_possessive_pronoun_worksheetksw56.pdf
    • http://findssldz.xyz/309018697302gi5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_0008ebb4310842a0a069fda65878373a.pdf?index=true
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_28113b5d691d4c69a7c601b9f09b7858.pdf?index=true
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_fcebdf9ff56d4369b6f736253e5fe447.pdf?index=true
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_af56cc8e86844bfb82540b373f42adc0.pdf?index=true
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_e7c81fe07f6a499a82f4df101d484831.pdf?index=true
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_04964f025cd9426a82175e40b355af07.pdf?index=true
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_c3ad3756fb684f3194d998f819ebaa17.pdf?index=true
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_1c6104dc97914830aad19488d0604743.pdf?index=true
    • http://weboxezave.epizy.com/dudelofesosamojasigop.pdf
    • http://memanor.epizy.com/wifedomidelufajokev.pdf
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_eec96c2605d548e482fc05aebb204021.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb0.bin
d45a13c0e4f366144efa793120be994aff4b7aa1ed4633ade22326b54128c472		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 5560 bytes
font_01_sfnt_off00011278.bin
24c4932319824a1b48a3c7fd3105e9cb087df90e1a33ad58f668ec3a7b6b70a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11278 11980 bytes
font_02_sfnt_off00013ba4.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 16092 bytes

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