Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aad9dc1c67e832c…

MALICIOUS

PDF

88.7 KB Created: 2021-03-23 05:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fb29fc68369233bbfb9addc01abdb21 SHA-1: 1bc6140cdbc7c03babcc526862446247c2a6a224 SHA-256: 4aad9dc1c67e832cf614880a5f9f6a84b9be12db81bd7fabe85297d3bb5629b2
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'zajinet.ru', which is likely a phishing or malware distribution site. The document body, though partially corrupted, suggests a lure related to 'spoken english topics for beginners pdf', aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/award?keyword=spoken+english+topics+for+beginners+pdf
    • http://nenegifivujaxu.mypressonline.com/omc_cobra_outdrive_repair.pdf
    • https://cdn-cms.f-static.net/uploads/4505102/normal_602f77bd0fe4e.pdf
    • https://static.s123-cdn-static.com/uploads/4386849/normal_5fe1a3b8d0658.pdf
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5ffc0b765cb20.pdf
    • http://nomokesus.sportsontheweb.net/sunage.pdf
    • http://mokemowowove.mygamesonline.org/system_analyst_roles_and_responsibilities.pdf
    • https://gizafagubezuz.weebly.com/uploads/1/3/5/3/135321184/doruzezurozubufivul.pdf
    • https://cdn-cms.f-static.net/uploads/4464522/normal_603792b1c110e.pdf
    • https://cdn-cms.f-static.net/uploads/4483075/normal_5fd10449bc799.pdf
    • https://nuluziberalisox.weebly.com/uploads/1/3/1/3/131379655/10cc4.pdf
    • https://cdn-cms.f-static.net/uploads/4383452/normal_600e5ab52f0a1.pdf
    • https://menuzuxa.weebly.com/uploads/1/3/1/0/131070619/a5adfde81b070.pdf
    • http://tadajixilatu.scienceontheweb.net/86672830291.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8b0066e3-3624-4696-ac41-d64f37153074/how_to_find_table_value.pdf
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_f9c66797a2254c74b580ad0c6607758d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a9b4473c-e805-4882-82b0-f1e4cde93eda/big_little_lies_season_1_episode_5_full_episode_free.pdf
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_7c99a8016af44d069f41929ae3c8d810.pdf?index=true
    • http://jemileti.atwebpages.com/siemens_hearing_aid_service_center_chennai.pdf
    • https://uploads.strikinglycdn.com/files/36929b35-af7c-442f-ac23-0ce4b4d41f74/how_to_build_a_wood_splitter_plans.pdf
    • https://3012fa3b-51b7-4264-898e-e15d6fab1eb1.filesusr.com/ugd/ee5524_c562cdde8d6c471dbbc13b02bf43e2ae.pdf?index=true
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_d502eb1c1ea84e97acf9b8a2e0f03142.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c7cefe60-fbae-4b5c-8c12-0ef09d11392e/fearless_songs_taylor.pdf
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_867f10f8c9654eaf9e7e6062eabc330a.pdf?index=true
    • 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_off000110d3.bin
2c69b30b6c692046dde4e5a9111b5226a1b29c308060acf6fe4f9368dd4c6a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D3 5300 bytes
font_01_sfnt_off000122d0.bin
a0653aeea689fb6fedbf500e8b591dbe77a65f44f29003dcefa09b361bd80567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 10704 bytes
font_02_sfnt_off0001470e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1470E 4324 bytes

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