Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc857d18c16a5f1…

MALICIOUS

PDF

70.0 KB Created: 2021-03-20 08:19:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c1857fcf8329d61ef901f32c66133fc SHA-1: bd93bbaf28f9001cc235c569257a718cb566d092 SHA-256: ddc857d18c16a5f11d1c5a20207853e9b254ab15f2928b31ce26bdc58c73d7e8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains or link farms, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9371

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/wix?keyword=clf+function+matlab
    • https://zabojipenow.weebly.com/uploads/1/3/1/6/131636987/61f264da3.pdf
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/7424047.pdf
    • https://cdn.sqhk.co/mugolino/h3ighfp/magic_piano_tiles_unblocked.pdf
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/cc734c2d.pdf
    • http://fexuvukenix.22web.org/algoritmi_informatica_clasa_a9a.pdf
    • https://cdn-cms.f-static.net/uploads/4424328/normal_601a776e8beb0.pdf
    • https://cdn-cms.f-static.net/uploads/4455907/normal_6054651cb4c38.pdf
    • https://xunitaminovo.weebly.com/uploads/1/3/5/3/135349323/jutofamulurum_ginunozemasikag.pdf
    • https://cdn-cms.f-static.net/uploads/4495855/normal_6048c3a68643e.pdf
    • https://cdn.sqhk.co/togodawexu/Qyij3ir/the_walking_dead_season_1_episode_2_dailymotion.pdf
    • https://cdn.sqhk.co/demexadol/cJjivjb/monster_dash_2019_results.pdf
    • http://botamasixijo.iblogger.org/juger.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2716bd39-ea5a-4be5-8251-0a6b5a714a5c/21893819050.pdf
    • http://wutukiruwis.rf.gd/calibration_of_ammeter_and_voltmeter_experiment.pdf
    • http://nimitijas.rf.gd/34020409387.pdf
    • https://uploads.strikinglycdn.com/files/187652ac-f6a2-4c6e-bbb2-6efec80912f5/2018_toyota_camry_hybrid_xle_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/a3d14aef-5f77-4ce1-abf0-0af2ddcb1e5d/78082407343.pdf
    • http://temefolix.epizy.com/the_girl_with_the_dragon_tattoo_2011_subtitles_english_2009.pdf
    • http://vojulemopo.epizy.com/appendix_a_apa_format.pdf
    • http://godidab.epizy.com/number_line_subtraction_worksheets_for_grade_1.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19d.bin
cb5c8c6405a97e289a1d37fd8f3fa0fb9a9e5cd02c3f475be668e5c7f8c23a8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 3312 bytes
font_01_sfnt_off0000fd7e.bin
b08e0558637eb75674abe8f8d1f90fe761c30f44a3d43dbf33116d20a9350e5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 4796 bytes