Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f38e391c673481…

MALICIOUS

PDF

80.8 KB Created: 2021-02-09 00:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a3d0c9d2ecdc3b2ab07bec4faad3c69b SHA-1: 90b8e3961d32ee1f2c9bffd67f454b1832975764 SHA-256: b2f38e391c6734815b4bcadd58a5fe2a52c314f64b02023cd46f9cf94361d647
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to link farms and redirectors, indicating a phishing or SEO scam. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically flags this as a Facebook credential phishing lure, directing users to a malicious Weebly URL. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to exploit user interaction, likely through embedded JavaScript or by presenting a deceptive document body, to lead victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/9697986.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://leonvi.ru/aws?utm_term=azur+lane+apk+1.+2.+4 PDF link annotation
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/9697986.pdfIn PDF document text
    • http://50off.pro/what_is_anime_porn_calledb9qzf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375699/normal_5fc94331cceb9.pdfIn PDF document text
    • https://wiraxupafetob.weebly.com/uploads/1/3/2/6/132696263/6d3c7a33db54c1.pdfIn PDF document text
    • https://vumiluvitut.weebly.com/uploads/1/3/2/6/132696113/xexev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5fee46c75921b.pdfIn PDF document text
    • http://shoop-ft.ru/metaphysics_aristotle_amazongq301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_601b453b9fa13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_5fd9d0af6ad39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466364/normal_6008cde20ace2.pdfIn PDF document text
    • http://netzamka.ru/lasker_s_manual_of_chess8g32w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466666/normal_600f275c9c729.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/vipinib/kizaxaf.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/status_asthmaticus_management_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/pobemojemexopunapa.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/78513682482.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/office_calculator_pro_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/itau_bba_international_plc_annual_report_2017.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 5044 bytes
SHA-256: 1d39651d13dd9b9c4d6939b2641e3cba87ba405bc22303f436c193ed91f7b822
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 14400 bytes
SHA-256: 118cbb7034b7e275cd5360cbba737d154000f740a5576f3a96b12254b04c3243
font_02_sfnt_off00011e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 16344 bytes
SHA-256: 088fccdb74a60710eb88c8f267617c65e2a36fce9a4e28c308983cb223458172

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