Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de20b889b1e03b5…

MALICIOUS

PDF

80.1 KB Created: 2021-04-04 21:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0815761cbe97cbc36bb50b4aa7c3600a SHA-1: d9d0c02b6657236a509829f40115a867965e782c SHA-256: 9de20b889b1e03b5e67e7ec1bcc71efcbbf8d7b6eda1839165ef82d8f4fc8672
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though truncated and obfuscated, appears to be a lure related to search terms, directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=craftsman+worm+drive+circular+saw+parts
    • https://fuwofinirofen.weebly.com/uploads/1/3/1/6/131637723/selonakijexogu.pdf
    • https://pisukobuvasojab.weebly.com/uploads/1/3/4/3/134398412/liviviliwikuwokapan.pdf
    • http://fishland.store/musagogarur1stix.pdf
    • http://insurancecarusa.com/738305882374pjz5.pdf
    • http://opsnatur.fun/metro_rail_map_los_angelesa6b41.pdf
    • http://xanusojuruxu.sportsontheweb.net/hdfc_life_opportunity_fund.pdf
    • http://davebamonuzove.medianewsonline.com/vizimewusidij.pdf
    • http://bumasujofoj.getenjoyment.net/ansys_workbench_13_static_structural_tutorial.pdf
    • http://netewe9.xyz/gelinixefofiwoymno0.pdf
    • http://magnifioco.site/19521704575vgqai.pdf
    • https://xatawozenovug.weebly.com/uploads/1/3/4/8/134886035/bovozefivof.pdf
    • http://vowuzemiru.medianewsonline.com/69602726392.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/webipejonavuv/apa_style_format_citation_machine.pdf
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_3d1e794633d141658a94ef60a1cb2761.pdf?index=true
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_b0e2a2dc4ab4431a8fcf141d89dcd24f.pdf?index=true
    • https://s3.amazonaws.com/dutimajizowa/players_handbook_dungeons_and_dragons_5th_edition.pdf
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_8c0bfa374e5145139ef66f2d67673fa4.pdf?index=true
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_1de9178b4cb941c18d8981272b20aa59.pdf?index=true
    • https://s3.amazonaws.com/vuraradaso/datalinidozivib.pdf
    • https://s3.amazonaws.com/sobaketemu/lisesazedogunaxifowexuz.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/sophos_authentication_client_android.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc16.bin
ffa1031884bc24f1c459846661dcdd88652788d5eb96ac494dcc1ae25b2e2c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 5360 bytes
font_01_sfnt_off00010e4e.bin
6627f1ba8b28e1dd6087d827d812f6262a1772bc7272b8b3528d143e34e1f6db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 10260 bytes

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