Malicious PDF — malware analysis report

Static analysis result for SHA-256 8169be2d8be40db3…

MALICIOUS

PDF

79.8 KB Created: 2021-04-17 18:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85f2204f0d8754a292170c73192862d0 SHA-1: 53a7ceab2e8804883d44b147d63df9cffd54a375 SHA-256: 8169be2d8be40db3eb87e72509ae5e9a32819b553ba9da51b7c0015147e176c6
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to 'free kindergarten books', a common tactic for social engineering.

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://xezojetit.ru/strik?utm_term=bob+books+sight+words+kindergarten+free
    • http://upgrade4me.com/what_is_physics_in_simple_wordsexa6x.pdf
    • http://soul-felt.com/digidesign_003_rack_revieww2kjy.pdf
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/gojodegaja-vawakezudaj.pdf
    • http://lemiritafuwab.22web.org/play_store_apps_showing_pending.pdf
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/2735926.pdf
    • http://xufunuduxatene.iblogger.org/ridudajexoxuf.pdf
    • https://filogeruziwumu.weebly.com/uploads/1/3/1/4/131406947/375e6fcca7f07b.pdf
    • http://tonedomopoja.scienceontheweb.net/23095709670.pdf
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/kukufojekato_gelokar.pdf
    • http://kewatupu.scienceontheweb.net/simakajise.pdf
    • https://zosagejezigim.weebly.com/uploads/1/3/4/7/134709887/nejef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1a874b69-633c-4cc9-8d6a-efaf89aa55c9/32147421990.pdf
    • https://uploads.strikinglycdn.com/files/87cfa346-08da-4050-afc6-2eede88ede48/7052743691.pdf
    • https://s3.amazonaws.com/rovikibixu/98760263715.pdf
    • https://s3.amazonaws.com/mukutud/apa_style_guide_6th_edition_sample_paper.pdf
    • http://rozasazi.epizy.com/carbon_nanotubes_structure.pdf
    • https://s3.amazonaws.com/viboxikuz/epic_seven_hero_promotion_guide.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_off0000e781.bin
0b2c9a71261f20c2791e4fcd619c593e129230f1c210da5e765fba62e98d2e4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 5272 bytes
font_01_sfnt_off0000f96f.bin
272a857df9c01c2b04ac819e277ae45ac3d584c76ddb8ce1f54e43694f84cd16
pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 11812 bytes
font_02_sfnt_off000121f5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 4324 bytes