Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab62cc5e76f22d1c…

MALICIOUS

PDF

61.8 KB Created: 2021-03-23 08:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fd9a8a3a6d3fadb0b9583f9a80db185 SHA-1: 817a87659ebcb9fe9f933bbac314c77532159fde SHA-256: ab62cc5e76f22d1c637bf11b1f9487b937b55e1cfe3d099ab78f8b2f3bc5c9d3
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a heuristic indicating an external URI. The embedded URL, https://leonvi.ru/wix?keyword=the+secret+life+of+the+brain+episode+1+worksheet, is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to educational content, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://leonvi.ru/wix?keyword=the+secret+life+of+the+brain+episode+1+worksheet
    • http://techanomic.com/40889342261ngmij.pdf
    • http://2022god.com/digital_photography_terms_reviewyfgx2.pdf
    • http://loxotuxer.22web.org/ritebavugujanazekaf.pdf
    • http://wizuvadidena.iblogger.org/baruluvamukizow.pdf
    • https://cdn.sqhk.co/zativojor/jehwgxa/tineju.pdf
    • https://cdn.sqhk.co/tosilura/iigdjib/jungle_adventure_in_island_world_hotel_chitwan.pdf
    • http://dimozakebaba.scienceontheweb.net/wetufufanojewu.pdf
    • http://bufanono.iblogger.org/bufuvuna.pdf
    • http://milesatel.mygamesonline.org/robadu.pdf
    • http://4gusevshop.space/347767077506w7ib.pdf
    • https://cdn.sqhk.co/dedogupazib/jh8Jjhb/clash_of_clans_hack_private_server_2019.pdf
    • https://cdn.sqhk.co/letowajaf/4sKggcs/nuwebilaxewatelo.pdf
    • http://josumewemuzob.getenjoyment.net/63260429257.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jekowatu.epizy.com/ubuntu_normal_font_free.pdf
    • http://salilizuvozel.rf.gd/84778960212.pdf
    • http://zojabavikejowi.rf.gd/xbox_one_wireless_controller_headphone_jack.pdf
    • http://worutigije.epizy.com/46712164627.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_off0000b961.bin
661ddf2a4c622b70514e036d427e2d282ed35335057b15cb866a2860bea5cdb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB961 5540 bytes
font_01_sfnt_off0000cc44.bin
6ed593b141e838652079ba3266e2b1d4e3e4a50cde4c2a1bb64a1c523a865221		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 8976 bytes

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