Malicious PDF — malware analysis report

Static analysis result for SHA-256 4258ef9d036b99e0…

MALICIOUS

PDF

65.0 KB Created: 2020-12-04 02:49:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 88a0389030f958581e3659a876b9cf67 SHA-1: 37c3321cca039f2f8dc56054401f764ae4614a33 SHA-256: 4258ef9d036b99e04bed75102002d6223e69955a0871881eb304d7e8f5a68bdf
224 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a brand-impersonation credential phishing lure, specifically impersonating American Express. It also contains a large number of external links, some of which are associated with redirectors. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

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
  • 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://bujibapi.weebly.com/uploads/1/3/4/3/134383234/zekosazufazegim.pdf.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffnew.ru/aws?utm_term=d%2526+d+stronghold+builder%2527+s+guidebook+pdf PDF link annotation
    • https://bujibapi.weebly.com/uploads/1/3/4/3/134383234/zekosazufazegim.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/8a06e49abdf1c1.pdfIn PDF document text
    • https://gerexogevi.weebly.com/uploads/1/3/4/4/134463414/557645c7f4.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/fudojosizozabaf_jusipu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc69e5d9955c744b563101b/t/5fc7cc9fca81f31e47bab1dc/1606929567952/retrograde_motion_of_mars_graph.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1d9757848ba205d1f35f1/t/5fc2f0e53c02f22b9d6e53c1/1606611173767/craig_jones_slipknot_mask.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1941db3-ee31-4367-845f-73a0a0281aa4/dopuzog.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/practicing_chromatic_guitar_scales.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9b8ef7301f8b108504/t/5fc5ebf8e18c5c478ec7d563/1606806521207/1651364715.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1a4b57d0c8f249d460ce3/t/5fc5c85ff8cdb769c6abfc3c/1606797407365/61738519884.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/battery_percentage_indicator_app.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_off0000c624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 4156 bytes
SHA-256: 9253c4ec90eb8b217ae91b3aef6412788d3d1419415539c5cfb70110cf842fd1
font_01_sfnt_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 10632 bytes
SHA-256: 4a2c2dca0fcdef47f15fe8cdcaac5030f55318fff0b758463bbe7afd3e945531

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