Malicious PDF — malware analysis report

Static analysis result for SHA-256 7219e5c5466b8c5f…

MALICIOUS

PDF

86.5 KB Created: 2021-02-24 17:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 311c0728d3a1116f8d6cc90e9523486a SHA-1: 0750b0c340d529a57f4a8975fbd98a2bcb5cd008 SHA-256: 7219e5c5466b8c5f7367d80e1d55089ba2f2eaeda2571243fd4109b5a42d36c8
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript

The PDF contains heuristics indicating it is a phishing lure, specifically impersonating Facebook and attempting to redirect users to a non-matching domain for payment details. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL `https://leonvi.ru/wix?keyword=the+hound+of+the+baskervilles+summary+chapters` is the primary indicator of this credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Brand-impersonation credential phishing lure high 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: call-to-action link host does not match the impersonated brand: https://leonvi.ru/wix?keyword=the+hound+of+the+baskervilles+summary+chapters.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=the+hound+of+the+baskervilles+summary+chapters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418993/normal_601cefa6db38f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481408/normal_6019d610ca9cd.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/84926544560.pdfIn PDF document text
    • http://superheatbelt.xyz/28572285556fiv4l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420748/normal_5feb6be45be1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_5fe6cf9134bf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445889/normal_5ffbe1abe6741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427295/normal_6030e885862dd.pdfIn PDF document text
    • http://form-copyrightservices.com/iec_standard_drawing_symbolseipx0.pdfIn PDF document text
    • http://legrand-spb.ru/bujesilofebimnq6xg.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/36179807583m07lj.pdfIn PDF document text
    • http://top-salez.site/split_cal_king_flannel_sheetsk0pgx.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/68909234920.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/dezezitararog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530151/normal_5ff2743a1a8b3.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
    • 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_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 5592 bytes
SHA-256: d82c815a0a6e39e3576a0ca4884d339bec573de57a00432f148cfbb805ae9dc6
font_01_sfnt_off00011a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 10504 bytes
SHA-256: c7a60a4dc62232a2798e227a4522821d87ae356ae41f47da97d13e10d5c0d882
font_02_sfnt_off00013e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E35 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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