Malicious PDF — malware analysis report

Static analysis result for SHA-256 798675dc3dccfa1a…

MALICIOUS

PDF

74.4 KB Created: 2021-03-27 12:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c6a42382388ee8f7397d52e1851903e SHA-1: 10d721c9cb2bd62f180d82c0930aef5a6b332426 SHA-256: 798675dc3dccfa1a8a47d29907fe469fb06a706e41cc7a8364c1db02667a127c
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a site offering a 'simplifying expressions worksheet with answers'. This is a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=simplifying+expressions+worksheet+with+answers
    • https://cdn.sqhk.co/pigajifaw/z1qNii5/jolefumejemikikidura.pdf
    • https://static.s123-cdn-static.com/uploads/4389797/normal_5ff8621cb2021.pdf
    • https://cdn-cms.f-static.net/uploads/4380883/normal_603f837d23945.pdf
    • https://cdn.sqhk.co/funixatugesi/mMIv9Iz/15512975004.pdf
    • http://kadabafomelu.66ghz.com/biwotaxojapasurapafo.pdf
    • https://cdn.sqhk.co/xovujiroveg/iaBihia/5_seconds_of_summer_teeth_13_reasons_why.pdf
    • http://risurevisawibe.iblogger.org/donuvobivozagaxivoxuzuwe.pdf
    • http://xujilutobidiko.iblogger.org/jurewevipape.pdf
    • https://cdn-cms.f-static.net/uploads/4460982/normal_605534dedd987.pdf
    • http://konanozopesan.22web.org/46302316371.pdf
    • http://zabotefix.iblogger.org/vusaruxumedadedezoxat.pdf
    • https://cdn.sqhk.co/jigavozef/oibYbhi/ice_climber_nes_game_genie_codes.pdf
    • https://cdn.sqhk.co/puzadowoke/ghcZjiC/easy_hockey_coaching_clinics.pdf
    • http://nubigawe.22web.org/51899361802.pdf
    • http://sifulodidikit.22web.org/97304460606.pdf
    • https://static.s123-cdn-static.com/uploads/4501996/normal_5ffa003a35adb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://revuzulikasulo.epizy.com/bollywood_actresses_photos.pdf
    • http://dibezage.epizy.com/kaufland_letak_liberec.pdf
    • https://s3.amazonaws.com/varolexexus/kexoruvapet.pdf
    • http://valopuloti.rf.gd/didiz.pdf
    • https://s3.amazonaws.com/tevigotu/cambio_climatico_causas_y_efectos.pdf
    • http://wewuwoxije.epizy.com/golf_cart_enclosure_club_car_ds.pdf
    • http://kulaxukiju.epizy.com/78093873214.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_off0000e149.bin
eed9904d4bd8e01b6a07f08b8d8f22a04057e9ff07097b61af4c48687df49b3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 5744 bytes
font_01_sfnt_off0000f4d2.bin
f705762ddfe201424643f449d6dec575990c058a1f8b76702cd810b2c8d2d02f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 10920 bytes