Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4092eff03bfe5da…

MALICIOUS

PDF

76.5 KB Created: 2021-04-17 02:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 783a715c73812a6ed4ec32ba6b4ca4ad SHA-1: 2a752da23770ab3a1ab40b67e68fd182ac7e7fb7 SHA-256: f4092eff03bfe5da7066b0177cab6c4fe7d37781152c1c7d83d4b8a6c513391d
116 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it contains external URIs and a callback phishing lure. The document body, though truncated and obfuscated, suggests a lure related to 'taking the dmv knowledge test' which aligns with the phishing pretext. The embedded URL `https://resalured.ru/strik?utm_term=how+to+take+the+dmv+knowledge+test` is the primary indicator of malicious intent, likely leading to a phishing or scam page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://resalured.ru/strik?utm_term=how+to+take+the+dmv+knowledge+test
    • http://alesyasemiletova.com/what_percentage_of_hedge_funds_beat_the_market5r1fw.pdf
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/fipogavabexej-duweno-jewokitisonef-gefuwuna.pdf
    • https://xetizokabonon.weebly.com/uploads/1/3/2/6/132696323/2580399.pdf
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/pufowunof-kurara.pdf
    • http://baxagaxisatipa.22web.org/82666423273.pdf
    • http://on24-system.club/908541515027dh99.pdf
    • http://itmax.info/867685587935o1m0.pdf
    • http://mowukedova.mypressonline.com/pdf_file_to_jpg_image.pdf
    • http://flylovel.com/30380920903qydlg.pdf
    • https://bikiwilusi.weebly.com/uploads/1/3/4/5/134512037/lojudakimevuzimate.pdf
    • http://kexumojazo.mypressonline.com/nios_deled_result_1st_semester_2020.pdf
    • http://agent-spv.space/new_mexico_tech_first_responder_training_programu0tor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wabiwixi.epizy.com/2982225016.pdf
    • http://zaniwemikadas.rf.gd/the_history_of_computer_science.pdf
    • https://s3.amazonaws.com/bejenosugede/kolkata_airport_flight_arrival_information.pdf
    • https://s3.amazonaws.com/wakuzidi/big_little_lies_song_season_1_episode_2.pdf
    • https://s3.amazonaws.com/norozovijalu/xejujulikexevi.pdf
    • https://uploads.strikinglycdn.com/files/efa0fa74-ea36-4d5b-b59e-6d886995281c/how_to_reprogram_viper_car_starter.pdf
    • https://s3.amazonaws.com/juzewojavomofew/biopsy_report_meaning_in_urdu.pdf
    • http://pepagulax.epizy.com/risk_assessment.pdf
    • https://uploads.strikinglycdn.com/files/65375d00-e0ba-4601-b1e3-e7bc62e8e385/learn_arabic_calligraphy_near_me.pdf
    • http://zotixawip.epizy.com/apcob_syllabus_download.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_off0000eb2e.bin
3f62c24a652f8984a37d75a511c23ba75f5bbd157aeec488a439b840616802af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 5320 bytes
font_01_sfnt_off0000fd3c.bin
515da1d07ba3f00e377c2d7d63cb849f79685444d71ee1f41d9c588c5def867f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 11140 bytes

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