Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd9711862fdef82…

MALICIOUS

PDF

73.8 KB Created: 2021-06-11 15:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4dac7704e92bd0eb3006ddaf3cea97fc SHA-1: a88c18917507bad9df69ea88f465efdd834dd0d7 SHA-256: abd9711862fdef82b8eb9135e30162dba3357c01046a70dec9ad1f8457ddb3e8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://medvor.ru/pbw?utm_term=stick+battle+fight+hack+apk', suggesting a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely used as a lure for phishing or malware distribution.

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 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://medvor.ru/pbw?utm_term=stick+battle+fight+hack+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450039/normal_600f1178ece99.pdfIn PDF document text
    • https://nunuwipan.weebly.com/uploads/1/3/6/0/136002942/e1ea85f4b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_60bfbd9eb4278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_6016da984a00e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_603a9089314dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_602a2383c2529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454967/normal_601020587e2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374362/normal_6055322a345d1.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/5135993.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d01bd842-e620-4890-99ce-3221177ab3d9/lepajuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43bed609-7063-4010-8583-e10cb49d9bf3/weluvevezezigepamap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/587570af-ca2b-413e-920d-abbeab9fb0d5/zofotovabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf81eb7-8da9-43bf-968a-030269188c21/naxijajimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e165d86-1e7c-4efb-8bdc-a6fdc4a1bc4d/jilutamibikenefuxusopuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55d848b-3bd9-4c03-bc8b-512cd7e11250/lejoburajamuredi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda6bcb2-9a9b-4527-b1f5-a8fad4d1b2f6/yamaha_125_dirt_bike_for_sale_nj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668b2727-8d06-4f29-8351-c9fccff2330f/sense_and_sensibility_characters_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4394bdd-1a6a-4f67-aa9b-010bcca4dcf1/fekivojemudewitexub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4f9145-b01d-4b02-9632-2c1be2415977/what_punctuation_do_you_use_when_quoting_someone.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_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 5308 bytes
SHA-256: 46be75a3a19652e788b437968a48037a2abd38ffaf54606cd65e9ee9b64d76fa
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 9880 bytes
SHA-256: 08287b19d8dfda332fe4db16ff55a53c3009bab7698e46363bf32fbd52dc9b7b

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