Malicious PDF — malware analysis report

Static analysis result for SHA-256 8324532b22505330…

MALICIOUS

PDF

73.9 KB Created: 2021-03-09 17:02:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 175d6f43274d44178d8676fe9baacad2 SHA-1: 75426a2624e0cfc97ad36bf2b12c6aed689fc7b1 SHA-256: 8324532b22505330897b3307fdba0e449838fa29b1a39f6d960ab4ce04900904
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links designed to manipulate search engine results or lead users to malicious sites. One prominent URL, 'https://jacksth.ru/award?keyword=cash+flow+statement+with+example+pdf', is presented as a lure. While no scripts were explicitly extracted, the PDF structure and the high ML classifier score strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/award?keyword=cash+flow+statement+with+example+pdf PDF link annotation
    • http://uaportal.site/kittens_game_new_player_guideak0pf.pdfIn PDF document text
    • http://apelsins.space/green_potatoes_pregnancylif75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fd08e30f01fd.pdfIn PDF document text
    • http://buyfastedcircle.xyz/logitech_g_hub_not_detecting_mouseu6c9o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464530/normal_6006f321677b6.pdfIn PDF document text
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/cffb4c67c45dad2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5ff625d6d2e9c.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/nokugisexawatura.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414682/normal_5fed6eb347582.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412195/normal_5ff87f86224b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pisedij/buvikomiwu.pdfIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_b626b8faac88475486a163aaba3100d2.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_87042832c5eb45f6a619a18784b660d6.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_04343bebbbb04c6fbf1190c79fada58c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/xodalexobuxosizitiwo.pdfIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_68d0832856414068b3b57b00593d0104.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejifavo/velifulisasodusupogo.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/run_tracker_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/fidawefozurotura.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_02b9b87f190a4853a46eaa7982fd104b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumagabu/jifoninepedolus.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/72257222795.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/gokexiwobari.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 5248 bytes
SHA-256: 8117c5b5f1521934b4a6b2764bda40aeef295abd312f44bd0f458450d15924d4
font_01_sfnt_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 10412 bytes
SHA-256: 4427c172ab9e0af9f29cdb9e453adb6cfef87ef18a2bd1a8f8cc3b5dd0598c26

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