Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae63616f13c553ed…

MALICIOUS

PDF

74.5 KB Created: 2021-02-16 02:04:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8df5fa89da2012eecf35c682e834fbd4 SHA-1: d6341a175375d72c4005b81a9704e3afa4668e61 SHA-256: ae63616f13c553ed833f52c0bf535e89241a73d95fc3e7c2fb131dba9891db41
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/1676188.pdf.
  • 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://jottigo.ru/wix?keyword=the+challenge+2020+asu PDF link annotation
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/1676188.pdfIn PDF document text
    • https://kuwomodelinero.weebly.com/uploads/1/3/0/7/130776449/jebosamuruvufavi.pdfIn PDF document text
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/navezo.pdfIn PDF document text
    • https://ruwefenoref.weebly.com/uploads/1/3/0/7/130739117/jokokof-vazopafoxoram-wijanawopas-vagim.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawitaxug/idC1hjd/my_business_instagram_account_was_disabled.pdfIn PDF document text
    • http://dokinal.iblogger.org/christopher_d_stone_should_trees_have_standing.pdfIn PDF document text
    • http://vesibigezedenu.iblogger.org/dozifo.pdfIn PDF document text
    • https://jenaniruwisaj.weebly.com/uploads/1/3/4/3/134317053/5573503.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/9423787.pdfIn PDF document text
    • https://narosixepitifon.weebly.com/uploads/1/3/5/9/135960882/6390898.pdfIn PDF document text
    • http://nalowisep.22web.org/advanced_manager_pro_apk_apkpure.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/genedesowul/11651113385.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/finance_calculator_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/chrome_manager_extension.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/maripan.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_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 5188 bytes
SHA-256: af080b69ce32ed828f73e05a40f638d3fbe486ecd9a92f0fdf3f9872c245e25a
font_01_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 10740 bytes
SHA-256: f972fa9a38c881c7e67a4f435cd0ac6c291f43caa9b55b707628123bd3c77303

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