Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a49badafd23596f…

MALICIOUS

PDF

69.2 KB Created: 2020-12-23 16:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 70c7b89ca30837d75153fc3452e576ba SHA-1: f2631526efb0c72de4350878e2d21c6357d8c581 SHA-256: 3a49badafd23596f5f61c4c8a84293a82c979f5a7ec5eb403117cdc5a315b04c
216 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating it's a phishing lure impersonating Facebook. It contains numerous external links, with one specifically pointing to a redirector that leads to a PDF file hosted on weebly.com, suggesting a credential harvesting attempt. The presence of embedded JavaScript, though not directly analyzed for its payload, further supports malicious intent.

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
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://wupuvogobed.weebly.com/uploads/1/3/4/5/134507139/1250551.pdf.
  • 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/aws?utm_term=activity+diagram+tool+free PDF link annotation
    • https://cdn.sqhk.co/fakobijo/gNhcjfS/anime_manga_boy_wallpaper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5fcea32aba18d.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/ngfjbwj/ship_sim_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/fhg0Ugj/rofojudewujodofutesoranu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5fcf4aecef922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5f9b0aa99da2c.pdfIn PDF document text
    • https://wupuvogobed.weebly.com/uploads/1/3/4/5/134507139/1250551.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/EJ8DghN/nuludakukozuzafet.pdfIn PDF document text
    • https://cdn.sqhk.co/parapirer/eBgfhi4/51264642439.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/xamapebonijos/business_career_sims_4_fill_out_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccdaefe1-88d0-41ef-b4de-f89e777b3d29/automatic_control_systems_kuo_10th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/14114516790.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/cryopreservation_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/kedanajo.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/nojilonupakuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7faf2ed6-0ae6-4ecb-adeb-dc5bc8263420/xazobexaxit.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_off0000d08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 5316 bytes
SHA-256: ccb1ffba245c54a22cd36f7772d624332240cb75d6531f40eeb19083db8f080d
font_01_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 11064 bytes
SHA-256: 2d2e52bf95225b70605b80213adfbaf04d7fcbd3b0dd1790b3005a47789fd9bd

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