Malicious PDF — malware analysis report

Static analysis result for SHA-256 b844f9e07cacbc09…

MALICIOUS

PDF

87.7 KB Created: 2021-04-16 08:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97a2a03181b151c681611e70e0fa1c03 SHA-1: c0d434e522f7e6a5cc653a05c99093f563de1003 SHA-256: b844f9e07cacbc0961688bed9ba8d683257583da1be2d880c708a698a2b7e920
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains numerous external links, with 'https://nipisod.ru/strik?utm_term=fourier+cosine+transform+of+e%255E-ax%252Fx' and 'http://vazupuvid.iblogger.org/50692872927.pdf' being prominent examples. The presence of these links suggests an attempt to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=fourier+cosine+transform+of+e%255E-ax%252Fx
    • http://vazupuvid.iblogger.org/50692872927.pdf
    • https://static.s123-cdn-static.com/uploads/4378383/normal_5feba9073f399.pdf
    • https://static.s123-cdn-static.com/uploads/4503692/normal_5fe032f85d798.pdf
    • http://rixokufofaru.iblogger.org/libros_de_fisica_caida_libre.pdf
    • http://jedufozares.22web.org/securecrt_crack_windows_7.pdf
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5fec9170a2fa0.pdf
    • https://cdn-cms.f-static.net/uploads/4422893/normal_5fdbbccd88dd9.pdf
    • https://cdn-cms.f-static.net/uploads/4466161/normal_60435db382083.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d56ad19e-3a2e-4457-aa4b-fbba4683af8c/us_coast_guard_mlem.pdf
    • https://s3.amazonaws.com/vapelurowar/jaxede.pdf
    • https://uploads.strikinglycdn.com/files/5ec82652-1b29-4022-814c-fbb8064cb8b0/genajutudeke.pdf
    • https://s3.amazonaws.com/batoragubukepo/36121997102.pdf
    • http://fijetetesozaw.epizy.com/nerumo.pdf
    • https://s3.amazonaws.com/ruzumeb/the_land_of_stories_the_enchantress_returns_reading_level.pdf
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_baf3fb3b43d34817bc8e734a2abb6364.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1aead231-893d-44a9-8f1b-8b5b0109d55d/47890447651.pdf
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_60f48b71e1464fed97db3956fbbf0b37.pdf?index=true
    • https://uploads.strikinglycdn.com/files/442fd63e-f67e-4f7e-80aa-40c8e83d5103/pose_book_free_download.pdf
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_a1ba2becefa74224ac2cbb12c299fb92.pdf?index=true
    • http://ramufezumax.rf.gd/audio_video_converter_android_apkpure.pdf
    • https://uploads.strikinglycdn.com/files/4d8ec314-5edd-497b-8bda-2747969fa147/vupof.pdf
    • https://uploads.strikinglycdn.com/files/4e8d75bd-4f95-4baa-b10a-43155f32b9e7/what_is_a_rhetorical_structure.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
stream_003_off000106f1.bin
cd3e473888c47a361feb970da9851f4125291b9dbd31b9e1dbc4f0489a09ff32		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x106F1 5016 bytes
font_01_sfnt_off00011806.bin
8b25c8f3029defba8a287f289fa27ac88c90d5bd015d2a2e092c81314c7c0b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 12528 bytes
font_02_sfnt_off000142b8.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142B8 4324 bytes

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