Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafc31a547b2199c…

MALICIOUS

PDF

78.8 KB Created: 2021-06-09 17:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0d851eb42895f3f3282ca943b0e0853 SHA-1: d063600b3a7906145808ae0d32156c4c693f2eaf SHA-256: aafc31a547b2199caaaa673fb1904dec07bf15441395fa714c7785aac20814a0
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'coretry.ru', which is likely the destination for a phishing attempt. The document body, though heavily obfuscated, suggests a lure related to educational content, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/pbw?utm_term=word+problems+involving+multiplication+of+fractions
    • https://cdn-cms.f-static.net/uploads/4409627/normal_604de3364b071.pdf
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5ffcdc2164d39.pdf
    • https://static.s123-cdn-static.com/uploads/4414873/normal_5fecf40824993.pdf
    • https://cdn-cms.f-static.net/uploads/4418778/normal_60bd820a1c6d8.pdf
    • https://cdn-cms.f-static.net/uploads/4498971/normal_5fd3d7dd3f9e7.pdf
    • https://cdn-cms.f-static.net/uploads/4366625/normal_60446854042e5.pdf
    • https://cdn-cms.f-static.net/uploads/4381964/normal_6022e937d5702.pdf
    • https://cdn-cms.f-static.net/uploads/4451350/normal_60506ae552795.pdf
    • https://cdn-cms.f-static.net/uploads/4372673/normal_6059f1bb336c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://redelaw.pbworks.com/f/solution_complete_zelda_majoras_mask_3ds.pdf
    • http://wusagem.pbworks.com/f/lejakosamubono.pdf
    • http://bovojigu.pbworks.com/w/file/fetch/144652275/2158515654.pdf
    • http://kawawuvaken.pbworks.com/f/11569384046.pdf
    • http://mumubib.pbworks.com/f/mercruiser_service_manual_6.pdf
    • http://wiliser.pbworks.com/w/file/fetch/144464820/which_way_is_90_degrees_counterclockwise.pdf
    • http://topanekegeza.pbworks.com/f/67770707106.pdf
    • http://moxulolo.pbworks.com/f/guion_teatral_de_los_tres_cerditos_y_el_lobo_feroz.pdf
    • http://biduzoku.pbworks.com/f/how_to_replace_water_softener_filter.pdf
    • http://mamejoniza.pbworks.com/f/complex_active_and_passive_voice_exercises.pdf
    • http://dibesusajob.pbworks.com/f/34886156183.pdf
    • http://punumiboxo.pbworks.com/f/20600919275.pdf
    • http://xutosop.pbworks.com/w/file/fetch/144440031/technic_launcher_cracked_download_2020.pdf
    • http://vobaranizume.pbworks.com/f/paxexefepudetadidibise.pdf
    • http://jesababa.pbworks.com/f/tijavovosew.pdf
    • http://lomexalipele.pbworks.com/w/file/fetch/144516336/analisis_pelicula_el_circo_de_la_mariposa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ca.bin
ed5d32501034fd2f064d0215ecc2ea177872ffd2dfbbb1ef54cb826bb9b0d194		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 5568 bytes
font_01_sfnt_off0000fab0.bin
bc76d1d3f406b39e1f3aa7a1e0ca1688e1ab5b51362f4cbc55ad27071a69d286		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 10480 bytes
font_02_sfnt_off00011ea5.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA5 4324 bytes

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