Malicious PDF — malware analysis report

Static analysis result for SHA-256 955fd6f3cba5f922…

MALICIOUS

PDF

83.4 KB Created: 2021-04-18 23:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 745ee556abdb88b5d415736e50e0be3a SHA-1: 0a1625a137ab6da1bd13e90755bddcf3d68b273a SHA-256: 955fd6f3cba5f9226413177b01b27936f05b325a3caf2835a715da66b520494d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a "mass external PDF link farm". The primary URL, "https://druttle.ru/strik?utm_term=basic+electrical+engineering+objective+type+questions+answers+pdf", suggests a phishing or SEO-based lure. While no scripts were explicitly extracted, the presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to redirect users to potentially harmful sites.

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://druttle.ru/strik?utm_term=basic+electrical+engineering+objective+type+questions+answers+pdf PDF link annotation
    • http://finonit.mypressonline.com/82313376775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_601f673adf1e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407782/normal_5fd901625a52b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_605f440a4c552.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xezujuxoz/chinarayudu_film_songs.pdfIn PDF document text
    • https://926fca10-1439-4adc-b819-38dad5327275.filesusr.com/ugd/26d6d3_4556e094046c4a599ff8f66c60f4f590.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/does_goat_simulator_have_multiplayer_ps4.pdfIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_e7acb108c1264b6b8dd885ff3946bc0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/garageband_file_type.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_67119efdfcba4795b2547d3e2da8d32c.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_410f267965be48cb84605450a56a8912.pdf?index=trueIn PDF document text
    • http://vekejuf.atwebpages.com/ayurveda_books_in_tamil.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_00bfb1f51fc94d1db533d76c78b4773f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/90370123731.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/free_bootstrap_templates_for_educational_institute.pdfIn PDF document text
    • http://kojuvurapamox.myartsonline.com/the_monkey_king_2_release_date_in_india_in_hindi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 5852 bytes
SHA-256: b1203a79d7a95ff681612c2b586e474a1c8f08df273d36272eeb97541bf67282
font_01_sfnt_off00010b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B03 11340 bytes
SHA-256: 90f4f6dff5d80957024da6f006d903f2a07bebf904d24d3751ac4d1daa65f695
font_02_sfnt_off00013185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13185 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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