Malicious PDF — malware analysis report

Static analysis result for SHA-256 526d889c924a63d5…

MALICIOUS

PDF

72.3 KB Created: 2021-03-21 12:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6748fbe4e30da24ba279f5c38b0c953 SHA-1: d7908b4e190ada23f588720adf8938b6e2c601fc SHA-256: 526d889c924a63d5a57b90a7917714188bdea7ec53f83d309613c94ec8e60343
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to a suspicious domain, 'botokaw.ru', which is likely used to host a phishing page or a second-stage payload. The document body, though heavily obfuscated, suggests a lure related to 'sheet music'. No scripts were extracted, but the presence of external URIs and the phishing detection strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=you+are+my+sunshine+ukulele+sheet+music
    • http://raraveluwogevuw.mypressonline.com/rsmssb_steno_syllabus_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4422643/normal_5ffbf075311b2.pdf
    • https://cdn-cms.f-static.net/uploads/4466379/normal_5fd1923c79847.pdf
    • https://cdn.sqhk.co/gebitasixa/ijogeFN/wonder_weeks_leap_4_sleep_regression.pdf
    • http://sokobumoxagug.scienceontheweb.net/faxajefanazorujotetesu.pdf
    • http://piriveva.scienceontheweb.net/brick_masonry_bonds.pdf
    • https://cdn.sqhk.co/fuvazuginu/ayVTn70/67869901554.pdf
    • http://lulopoboxefon.scienceontheweb.net/56063629610.pdf
    • http://nexefugo.iblogger.org/26226967463.pdf
    • http://mafuditovu.iblogger.org/lufojaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2a14a631-a174-44c1-bcd4-32da2eff8128/the_road_back_to_you_podcast_spotify.pdf
    • https://uploads.strikinglycdn.com/files/5a0d8b20-5bb6-43b9-9794-5696e28e0f5a/pizonomivimigikaja.pdf
    • https://uploads.strikinglycdn.com/files/3db4d574-3f6c-44d0-89de-3f2f7bcfb731/because_i_could_not_stop_for_death_summary_shmoop.pdf
    • https://uploads.strikinglycdn.com/files/ad9dce61-2ad8-4057-8095-612312b8019b/how_to_install_rancho_steering_stabilizer.pdf
    • http://fovawipemezipu.myartsonline.com/nowizojamaju.pdf
    • https://uploads.strikinglycdn.com/files/7f257967-8890-4c43-8182-afe18ca79eab/why_is_my_amp_blinking_red.pdf
    • https://uploads.strikinglycdn.com/files/660dcef2-463c-454e-bfe5-5e40255b786e/rilupotunujet.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_off0000dec1.bin
dabf6e5f9975ffbce18ce5915b213c78eca05fef7756560af14227c2292b0ffe
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 5164 bytes
font_01_sfnt_off0000f031.bin
d17a487f313ab70656d57899f76b304fd0ddb04f46512c53fdcaea49743b6254
pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 10500 bytes