Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f8f2d30038d204…

MALICIOUS

PDF

65.5 KB Created: 2021-03-06 09:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c026835498e5ad5ef4556c928b807c60 SHA-1: 93cca72c6c00eea1e4f3d55526a1f41137a2dd90 SHA-256: c5f8f2d30038d20499ca8c6daf96c63a56d3daee4da069deb4af309b3dd62c70
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting. The document body, though heavily obfuscated, appears to contain text related to 'Oscar's auto body and mechanical', suggesting a lure to disguise the malicious nature of the links. No scripts were extracted, but the presence of numerous external links points towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=oscar%2527s+auto+body+and+mechanical PDF link annotation
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/8f84e3.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/how_to_make_anointing_oil_biblically.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/sobeg.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/math_worksheet_for_kindergarten_3rd_class.pdfIn PDF document text
    • https://kabaposirivapej.weebly.com/uploads/1/3/2/6/132680813/lusemojifoz.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/13250871968.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/zurovajij/85376918762.pdfIn PDF document text
    • http://vumigewinumuzi.epizy.com/miwevafamutunifodez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7f52c0-6440-4cec-8f24-f92995946790/liwuwatoberuwuralenubese.pdfIn PDF document text
    • http://donofetesexok.rf.gd/wigapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0878897b-c8fd-4e97-a1f8-8061a307ffac/panelview_1000_to_panelview_plus_7.pdfIn PDF document text
    • http://benamow.myartsonline.com/nixon_unit_40_black.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/audacity_2._1._3_windows_10.pdfIn PDF document text
    • http://bugazepoja.onlinewebshop.net/29216739089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bae5013-6c1a-4663-bd33-49bbe115d6ca/how_to_use_chirp_to_program_baofeng_uv-82.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_off0000c381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC381 5480 bytes
SHA-256: 1570906dfe7475c8dd6e1db28e2716ad8870d5f3a0db56fdb88a275bb188b936
font_01_sfnt_off0000d5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 10164 bytes
SHA-256: 215e5099bf312d1a6fe7853eb1c8a71221c9f8bc96382e6221d6d4560ba6a8af

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