Malicious PDF — malware analysis report

Static analysis result for SHA-256 430fcc21439940d7…

MALICIOUS

PDF

84.5 KB Created: 2021-04-06 09:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6085d96eeeb01b1d3d6a2e43061d85e6 SHA-1: aba2362c5de352e98a4b3e8db26f26717d34d252 SHA-256: 430fcc21439940d767422560613068c1f2d15bba02ebd121598869af6897309e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with a primary malicious URL pointing to 'mezovovuduw.ru'. The document body, though heavily obfuscated, suggests a lure related to 'balancing chemical equations practice worksheet'. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest an attempt to redirect users to malicious content.

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://mezovuduw.ru/award?keyword=balancing+chemical+equations+practice+worksheet+with+answers+pdf
    • https://cdn.sqhk.co/zifeduwa/agjGJgj/komulenuvokebivuwevim.pdf
    • https://cdn.sqhk.co/bepemuno/SgiMI98/pool_live_pro_8-_ball_9-_ball.pdf
    • https://cdn.sqhk.co/wolanojijen/igjdoye/snow_bike_racing_x_games.pdf
    • https://cdn.sqhk.co/rularijulen/Ihf41gc/8574997435.pdf
    • http://werewov.22web.org/gerinexukusiwosajizan.pdf
    • https://cdn.sqhk.co/miwavilusaji/biegPXt/19427496311.pdf
    • https://cdn.sqhk.co/wufotubi/dEN6ibz/57297363837.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/54bf0795-9a64-4d7f-8418-6786e1fffde7/how_much_does_a_sql_database_administrator_make.pdf
    • https://uploads.strikinglycdn.com/files/72c5ea08-074a-4947-ae8a-8e4ec3cede0e/problemas_economicos_en_el_mundo.pdf
    • http://nodixuzotegiv.rf.gd/44511074279.pdf
    • http://vugovule.epizy.com/metabolic_diseases.pdf
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_bbafa1953f7046b59e800ef872b54d4f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/58f46115-8441-42a4-9dbd-e68d8009c913/how_to_enable_shortcut_keys_in_word.pdf
    • https://uploads.strikinglycdn.com/files/9728f333-48c9-493a-881d-aec8946e6990/fotezitaroxusutat.pdf
    • http://gebezixenunil.epizy.com/44020775621.pdf
    • https://uploads.strikinglycdn.com/files/7c7a296a-c450-4e58-9bf3-3e4c61c34d3b/boy_scouts_store_milford_ct.pdf
    • https://uploads.strikinglycdn.com/files/18ebcc8d-d98d-41ec-9261-d01f43bfab4d/80713496294.pdf
    • https://uploads.strikinglycdn.com/files/82507359-6006-4d2a-af25-c0cbc5269c33/annovi_reverberi_pump_unloader_valve_adjustment.pdf
    • https://uploads.strikinglycdn.com/files/4150f1d8-e71f-4b4a-9ec1-3697ac803db5/wapopoxojijuxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010183.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 2828 bytes
font_01_sfnt_off00010b7d.bin
ac3a6d8ecd98aaf986add4cdff5362323713c19367c97a2309297b170e23a018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 5900 bytes
font_02_sfnt_off00011f74.bin
3c2be60b6309c11da726c74420829bb708638a8564ed62cbbc9926d761676a3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 10004 bytes

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