Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6753ff0ab836f42…

MALICIOUS

PDF

76.0 KB Created: 2021-03-31 15:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc10dd432d96d5d89ae98be3013168cf SHA-1: 3d4be22f1eb5902f4d076f06c82c0b48ddf4b3d0 SHA-256: f6753ff0ab836f42994dd009e9cb60f5a89f112dbd9c7c9016c7ce4988871299
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with one prominent URL pointing to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of embedded URLs and the overall detection strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jacksth.ru/strik?utm_term=how+to+describe+warm+weather
    • https://cdn-cms.f-static.net/uploads/4403814/normal_60403147534b6.pdf
    • http://fukijuwevo.getenjoyment.net/if_clauses_second_conditional_exercises.pdf
    • https://cdn.sqhk.co/pikuresob/ZENWpCA/chikungunya_vaccine_clinical_trial.pdf
    • https://cdn.sqhk.co/kagalitisup/ihNcugf/3_yellow_classic_cheats.pdf
    • http://wuvarijawogog.iblogger.org/76109837168.pdf
    • https://static.s123-cdn-static.com/uploads/4470841/normal_5fe00415ad715.pdf
    • https://cdn.sqhk.co/bakimexatura/LheibPm/asus_vivobook_15_x510ua_manual.pdf
    • http://fuxutigox.mypressonline.com/pelvic_bone_anatomy.pdf
    • http://xoxapepagaxon.mypressonline.com/90848844179.pdf
    • http://pibarulajido.getenjoyment.net/pediatric_anesthesia_worksheet.pdf
    • http://sell-toclick.online/hoover_windtunnel_max_capacity_petbjak4.pdf
    • https://cdn.sqhk.co/balijanawi/Jjgjeha/59727936189.pdf
    • https://cdn.sqhk.co/xesozugis/fibkXjc/38068024191.pdf
    • http://boost-store.net/44928974253i963n.pdf
    • http://kufafukedexepix.mygamesonline.org/87363755569.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7bec7d26-fab0-4a0e-9ed6-71e764efd427/26651655510.pdf
    • http://lukewavir.rf.gd/adobe_illustrator_cs6_for_beginners.pdf
    • http://mafakizukizunof.epizy.com/bleacher_report_50_best_nba_players.pdf
    • https://uploads.strikinglycdn.com/files/d5f44cdc-25b7-4bcb-a72a-a121862abc48/how_do_you_calculate_calories_in_dog_food.pdf
    • https://uploads.strikinglycdn.com/files/fadc57c2-96d0-492d-adab-3ac9a514f865/2162232707.pdf
    • https://uploads.strikinglycdn.com/files/e9929799-9735-44b0-9617-e61640ab8073/zidaxa.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_off0000ec4b.bin
42cf95d2ce6bb87d68cbeffe6695fdf8952ce217210397c378b3e2d4f4efa6b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 5340 bytes
font_01_sfnt_off0000fe54.bin
3ccbc47659afbf7245c735993a1957a1a476ce6b2b04f99a49da3bde46ad986f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 10644 bytes