Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd2372a485570a2…

MALICIOUS

PDF

81.7 KB Created: 2021-03-14 02:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1c22ed34baf957dd416b4df80dccc0f SHA-1: b688608fce0c27ebcbff66aef98346be603f7e89 SHA-256: 9cd2372a485570a23a9d661027569b7293a29d63fdd49246f6b67dbc000d08cc
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://nipisod.ru/wix?keyword=antibodies+a+laboratory+manual', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to a laboratory manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/wix?keyword=antibodies+a+laboratory+manual
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5fd309f0319f9.pdf
    • https://static.s123-cdn-static.com/uploads/4392453/normal_6004302d6a462.pdf
    • https://static.s123-cdn-static.com/uploads/4464735/normal_5fc6ae7af179f.pdf
    • https://cdn-cms.f-static.net/uploads/4482219/normal_604af403e6477.pdf
    • https://cdn-cms.f-static.net/uploads/4488582/normal_604af523a2452.pdf
    • https://cdn-cms.f-static.net/uploads/4487916/normal_5fd806dcefc2d.pdf
    • https://cdn-cms.f-static.net/uploads/4365525/normal_6035d77ce6b4c.pdf
    • https://cdn-cms.f-static.net/uploads/4409814/normal_60236139cfa75.pdf
    • https://cdn-cms.f-static.net/uploads/4368492/normal_60446ab152edf.pdf
    • https://cdn-cms.f-static.net/uploads/4496372/normal_6042ed6d6d654.pdf
    • https://cdn-cms.f-static.net/uploads/4415745/normal_6035a88d07c91.pdf
    • https://cdn-cms.f-static.net/uploads/4475586/normal_6029b354ca44c.pdf
    • https://cdn-cms.f-static.net/uploads/4391302/normal_60215b5f3a9d9.pdf
    • https://cdn-cms.f-static.net/uploads/4529977/normal_60209bb1643ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nijudow/85601439060.pdf
    • https://uploads.strikinglycdn.com/files/4b33dc8d-68d4-412b-964b-fcbd58b3d99c/96289830916.pdf
    • https://s3.amazonaws.com/padadutiseni/36042553768.pdf
    • https://uploads.strikinglycdn.com/files/7288520b-ca90-469e-87d4-b47a849b6cdd/jirugemubemojotajikun.pdf
    • https://uploads.strikinglycdn.com/files/f928bfd5-dc18-4304-a84b-bf02aa91e4bf/84820323695.pdf
    • https://s3.amazonaws.com/wetevali/antistasi_arma_3_guide.pdf
    • https://s3.amazonaws.com/zosevid/28416456128.pdf
    • https://uploads.strikinglycdn.com/files/374198ac-201b-417b-84e4-ba3b3269b33f/sp_racing_f3__gps.pdf
    • https://uploads.strikinglycdn.com/files/63e1287c-9233-4693-8817-cc1b58ebfe91/is_the_roomba_960_good_for_pet_hair.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_off0001001b.bin
3e6339711ada1b5d78c57821d43fe9ecb0150c34e8ce1d94a22587f6c578cdd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 5204 bytes
font_01_sfnt_off000111b7.bin
69d6750bf330cb182bfcad6fe4cfb278f9dc004577f55c2c4b2dfc9d7dfc352e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 11360 bytes

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