Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1eba1b822508a97…

MALICIOUS

PDF

80.1 KB Created: 2021-03-25 08:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f240bff055c200003bb53d26e7d8253 SHA-1: d6197759ae7baf74c2d9473e96b8a3a48b9151cc SHA-256: b1eba1b822508a97daa839b1954538f9bcd0f9fd79991038bd0c3dc99a6e7fd6
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'zajinet.ru', which is likely used to deliver a phishing or malware payload. The document body, though heavily obfuscated, contains references to the URL, suggesting it's part of a lure to trick users into clicking it. The presence of external URIs and embedded URLs strongly suggests a phishing or credential harvesting attempt.

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://zajinet.ru/award?keyword=basic+cinematography+techniques+pdf
    • https://cdn-cms.f-static.net/uploads/4384159/normal_603cc1bae825c.pdf
    • http://sallehub.xyz/32106658490katko.pdf
    • https://static.s123-cdn-static.com/uploads/4460243/normal_60094e6a96100.pdf
    • https://cdn-cms.f-static.net/uploads/4459035/normal_6031e882529a2.pdf
    • https://cdn.sqhk.co/xafeperale/g5Tx5hb/xepefu.pdf
    • http://parovosi.mygamesonline.org/aptitude_shortcut_tricks_download.pdf
    • http://raftgjgr.space/kenshi_custom_startxbwak.pdf
    • http://sizegoduxuxa.mygamesonline.org/bombas_de_ariete_hidraulico.pdf
    • https://cdn.sqhk.co/pefevepufi/jbjchfj/97637867133.pdf
    • https://cdn.sqhk.co/tipadasa/jhgeidW/22915320683.pdf
    • https://cdn-cms.f-static.net/uploads/4373983/normal_6059f34dc3a76.pdf
    • http://wurikiwerofa.getenjoyment.net/cara_convert_ke_word_android.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_653a7b43fc484c63830e4b859ebc71a2.pdf?index=true
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_c99f1f4e70674c2ba511c6a135ebdc2f.pdf?index=true
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_081e55a96eca44d5984b1eebfe70d04c.pdf?index=true
    • http://giworutiw.myartsonline.com/54285697210.pdf
    • https://uploads.strikinglycdn.com/files/620648e2-8e15-4c4b-bd2d-855b4074b91f/average_sat_essay_score_uc_berkeley.pdf
    • https://uploads.strikinglycdn.com/files/640983f2-3d97-4718-90b7-4d76558adb30/how_to_weight_train_for_strength.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_off0000fb3d.bin
deaf4388edcef727b3fb45315077d6e4e0fddee3259a5eb6d54ffdcbf281fa10
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 5816 bytes
font_01_sfnt_off00010ee6.bin
06dbf75c8a5a1f5300b5af26a168105347d3b6d221baf088c8cbc6268a879cfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 10624 bytes