Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c944bb4a791028…

MALICIOUS

PDF

84.8 KB Created: 2021-03-29 20:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 204de4ea481e9dd7b1402c3c73ec2685 SHA-1: 7420962e7ee5cf034b3fee9bbdc92f4618bd4eeb SHA-256: 50c944bb4a79102856fe3d7ed49a4bca4ebdfa0a42c320e8d7c858d4c20bcc29
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, vilenefex.ru. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were extracted, the presence of external URIs suggests an attempt to download further malicious content or redirect the user to a phishing site.

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://vilenefex.ru/award?keyword=proof+of+sum+of+arithmetic+series+pdf
    • http://tlgfree.xyz/sosowewom9lqx8.pdf
    • http://bitjoms.xyz/nissan_qashqai_n_connecta_2019_manuall5qzu.pdf
    • http://indir-kazan.com/kavasinovurinuvinzlz8e.pdf
    • https://cdn-cms.f-static.net/uploads/4409818/normal_602e4ad8377e7.pdf
    • https://static.s123-cdn-static.com/uploads/4446158/normal_6004e0071d1f4.pdf
    • https://cdn-cms.f-static.net/uploads/4446395/normal_6035e403ac38b.pdf
    • http://modutomipofa.iblogger.org/radebelegataxunitatasemup.pdf
    • http://health-top.ru/41890985270z9okv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e9b1f008-2500-432e-a285-6e0c697d2d8b/ez_go_golf_cart_stopped_running.pdf
    • https://s3.amazonaws.com/sazixipame/vuxibola.pdf
    • http://kujodobiwug.rf.gd/27633130903.pdf
    • https://uploads.strikinglycdn.com/files/131ac109-ef16-4528-9271-21489a271c1f/38716816647.pdf
    • https://uploads.strikinglycdn.com/files/26cc25e7-bbef-47ae-aa53-e6fa8fccf0d5/pojawunupo.pdf
    • https://uploads.strikinglycdn.com/files/940fdf22-ab5b-4fc8-ab8e-06f469d0d807/74775726963.pdf
    • http://wozojatoxako.epizy.com/dobaxinatiferijibir.pdf
    • https://s3.amazonaws.com/bogijexu/15696774921.pdf
    • http://filipebed.rf.gd/vakimex.pdf
    • https://uploads.strikinglycdn.com/files/3476cf3e-e9ea-4c7d-8ce6-f8d648cdf79a/how_to_read_violin_notes_for_beginners.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f417.bin
a261e10a3568ef4f953bf66fa196e95152dde46e455b0760d889ec9c1f7cf1ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 5364 bytes
font_01_sfnt_off0001062b.bin
614c3829942420a14a7a0c5969d1192dffd3730544cc73e14a32e97d2b52a338
pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 12524 bytes
font_02_sfnt_off00013070.bin
0e9660d462f3853f214b8c809e551daf1ea655463c3a22f249c648a7021f432c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13070 16112 bytes