Malicious PDF — malware analysis report

Static analysis result for SHA-256 27269a5f475e0a4c…

MALICIOUS

PDF

87.6 KB Created: 2021-03-22 06:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba449e91f1937167ee899d3b9480a0f8 SHA-1: b898fad86c8aeb75a102c88b095310fb248f2105 SHA-256: 27269a5f475e0a4c0411f9674a7bf9c627443e73b550f7e47ff55982329acc10
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 URL pointing to a suspicious domain, which is likely used for phishing or to download a secondary payload. The document body, though truncated and containing non-readable characters, suggests a lure related to student activities.

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://jumiwimov.ru/strik?utm_term=stress+activity+for+high+school+students
    • http://mewuravis.iblogger.org/bonitas_boncap_pathology_forms_2018.pdf
    • https://cdn.sqhk.co/lazemowul/d5ja6ha/chase_mobile_checkout_app_download.pdf
    • https://cdn.sqhk.co/kufagilan/iIDhj16/fapivizolirowikozunapa.pdf
    • https://cdn.sqhk.co/botonerepap/ehgdjjh/sunalegir.pdf
    • http://padigixatobezu.22web.org/asphalt_8_mod_apk_3._6._0k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fbacb068-13b3-4d3b-a1ca-ca1b38533d4d/rubber_band_exercise_program.pdf
    • https://s3.amazonaws.com/miledu/81874242984.pdf
    • https://s3.amazonaws.com/dubiditiginowo/infosys_aptitude_questions_for_freshers.pdf
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_6aae26b2051d4b30bd7ea3b4ba3dad43.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ac11977c-35dc-410b-a761-1fc9a3c8788d/hoover_floormate_deluxe_hard_floor_cleaner_fh40150_amazon.pdf
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_b8cf18c97f234692b7cbf7f0a2e99a7d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/330f7e07-6278-4d46-b6c3-5279756a3c24/sewaxubasuxugax.pdf
    • http://pebulibupa.rf.gd/loduxurezemonavezubadi.pdf
    • http://pifajipap.rf.gd/kejoxegitodasag.pdf
    • https://s3.amazonaws.com/safenalavojuwu/dust_sheets_for_stairs.pdf
    • https://s3.amazonaws.com/mubemutolewe/50229073688.pdf
    • https://uploads.strikinglycdn.com/files/dad1d0ac-fe2f-41d3-9a13-a57c80a8eaa2/sanifokeluwewapavap.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_off00011962.bin
088d331f956185cb73e82e76bcce38ded2db476c5307f63815de2e2bad00aa02
pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 5548 bytes
font_01_sfnt_off00012c42.bin
f68cd0143da2ea2efdbeddb2345f8e7d218086e64db33c05a8c1249b0510ebeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C42 10884 bytes