Malicious PDF — malware analysis report

Static analysis result for SHA-256 3556bcffc27c035e…

MALICIOUS

PDF

65.3 KB Created: 2020-11-11 02:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1408faf85babdad2387d1abca2816058 SHA-1: d696023f7373e28c1091a019f6686c60eebec898 SHA-256: 3556bcffc27c035e87b9e27e2a2d72cc945a70085461835eb3c30df50781e7bd
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a heuristic indicating a browser extension or update installation lure, a common social-engineering tactic. It also includes an external URI pointing to a URL that suggests a download lure for 'tor browser download app'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/strik?keyword=tor+browser+download+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414867/normal_5f9c66ad4815e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455179/normal_5fa1e38fde571.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/zirojopemup/falcon_4.0_bms_4.34.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/deweluridujuzumem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5507f09c-50c0-4e46-bc0c-00a32c053b52/parubisabisokapugeve.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/marriott_banquet_training_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/rainbow_rowell_attachments.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/65273299422.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/dometic_brisk_air_ii_install_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55444281-cf6e-4248-9bec-a34392e8bd42/litunuwubiragozid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/495d1089-e105-422c-ac98-e82c9e965072/the_physics_of_wall_street.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/pevafenilikejemevugisi.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/mugipulejesewe.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_off0000c421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC421 5136 bytes
SHA-256: 66d4bbb2823a63c1b513c7da0d36e6f25aff89b7f2dd65ad3c93ba89a744ff8a
font_01_sfnt_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 10112 bytes
SHA-256: 4ff6f91c3f2dbd2b1608f654aeefa11f60aadcef3ff1ef71e580daa84d8e7a9a

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