Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bda103bc7592da…

MALICIOUS

PDF

157.2 KB Created: 2020-11-07 20:35:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 56582bddeb4f7b8ad07edb7a85902106 SHA-1: d6c2f56e7b6a6ffe2450c2a33b5457bd271ffb68 SHA-256: e1bda103bc7592daa46f66a41c82c1a2969824daac929c74e885d7c6715cff6d
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it's a malicious redirector and a brand-impersonation credential phishing lure for PayPal. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector finding. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/leloritubuge.pdf.
  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffmen.ru/123?keyword=sketcher+coupons+2018 In PDF document text
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/leloritubuge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_5f92aaf0eeed0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pubosepiko.files.wordpress.com/2020/11/9862343518.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/golden_chick_job_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfdd5efb-9db8-427c-bf4b-f4426751cc9b/80864842299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec177b6-aa80-4743-b127-b364da5418c1/3260988269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cb88aa-303c-4cf3-8a27-68dc501147bf/lapikenuvuzixudevidu.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/kodukimenofep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66bcfdc-4d27-4d18-a913-d98077518381/55928284456.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/88077111071.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_off00021649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21649 5468 bytes
SHA-256: 37a96d9d49c788dff0c8a6ab425d4da40e69d08c00c4aae283b4684a8283c6cf
font_01_sfnt_off000228ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x228ED 11792 bytes
SHA-256: 717fe660eb4bc09d116c5b4790ff1e650015eecab9eaa2e4a66cb73dd7a3a827
font_02_sfnt_off00025174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25174 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf