Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69878c1b4e445f4…

MALICIOUS

PDF

71.1 KB Created: 2021-06-01 12:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0de4a8e0239bce0bb6d4c05efabdad5b SHA-1: 19c29ef6de1938955850ac92eb18878b78ae0f70 SHA-256: a69878c1b4e445f48a220b77419b66b3df12fa427fe2f103a971c0164bb7ad30
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to 'https://queure.ru/pbw?utm_term=application+of+computer+in+chemistry+pdf', which is likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/pbw?utm_term=application+of+computer+in+chemistry+pdf
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5ff8d9c6e4ab6.pdf
    • https://cdn-cms.f-static.net/uploads/4377928/normal_60696ed54138d.pdf
    • https://cdn-cms.f-static.net/uploads/4408324/normal_604412ea5af90.pdf
    • https://cdn-cms.f-static.net/uploads/4495413/normal_6022d5409c6cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lekuzax.pbworks.com/f/gelebonegulufowatuwaf.pdf
    • http://pagorevet.pbworks.com/f/juwivalujasitikisevifovu.pdf
    • http://mefijunov.pbworks.com/w/file/fetch/144420597/how_to_become_an_electrical_electronics_engineer.pdf
    • http://lakebimutep.pbworks.com/f/45837877842.pdf
    • https://uploads.strikinglycdn.com/files/bd92147c-9ae7-46c5-a7cb-ab1f3840a682/why_isnt_my_hp_envy_5530_printing.pdf
    • http://sepaxebi.pbworks.com/w/file/fetch/144413727/gakojozisitusozidibika.pdf
    • http://pupowivala.pbworks.com/w/file/fetch/144426171/32749882618.pdf
    • http://wojipag.pbworks.com/f/why_the_hell_are_you_here_teacher_unblocked_reddit.pdf
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144425094/82917365565.pdf
    • http://gosirata.pbworks.com/f/gelifapixilagoxevegewofos.pdf
    • https://uploads.strikinglycdn.com/files/86e0aa7b-c0c7-49df-a16e-0789284840d5/pejitexuletebutod.pdf
    • https://uploads.strikinglycdn.com/files/354818e5-ae3b-4008-901c-f17117bf4390/7695929850.pdf
    • http://zepadatoju.pbworks.com/f/what_is_the_best_free_anatomy_app.pdf
    • https://uploads.strikinglycdn.com/files/3477f049-6a88-4f3c-9b77-bf73f3997c5d/popugibejidizubejegis.pdf
    • https://uploads.strikinglycdn.com/files/40558a48-3349-4ea5-916c-35c222e20f94/en_el_nombre_de_la_rosa_pelicula_online.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_off0000d80a.bin
5c9caf1e7cf3a97571d32dbe4654a857e0cef7427db3da92d5a4dbbd41742748
pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 5484 bytes
font_01_sfnt_off0000ea96.bin
e96e111c76b6a4c5b1415e70c4a06b4d0a9cecec409faab341b78c0ec5c0f9c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 10716 bytes