Malicious PDF — malware analysis report

Static analysis result for SHA-256 328279fcb6ba00c6…

MALICIOUS

PDF

74.3 KB Created: 2021-01-17 14:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 23eda68c7f4199f0670f4a777a296e4a SHA-1: beb1414998bcdcac583d3f72c141b23c6e0406f4 SHA-256: 328279fcb6ba00c6cf16d9b3d4c4963e75e51983319f457b192764228784d03c
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically for brand-impersonation credential phishing. It contains numerous external URIs, including one pointing to a known redirector associated with eBay phishing. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of embedded URLs and the phishing lure strongly indicate an attempt to trick users into providing sensitive information.

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://sefovajeve.weebly.com/uploads/1/3/0/7/130775607/bodetunaw-ravuwuzoxoputo-xosof.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://trafficel.ru/aws?utm_term=school+days+mod+apk+android+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5fa1c7ce7327e.pdfIn PDF document text
    • https://site-1173582.mozfiles.com/files/1173582/from_sea_to_shining_sea_book_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fc76de0510b7.pdfIn PDF document text
    • https://site-1175236.mozfiles.com/files/1175236/19889991321.pdfIn PDF document text
    • https://sefovajeve.weebly.com/uploads/1/3/0/7/130775607/bodetunaw-ravuwuzoxoputo-xosof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421782/normal_5f9e76637b3a5.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/2261901.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374957/normal_5ff9087db8c54.pdfIn PDF document text
    • https://site-1176481.mozfiles.com/files/1176481/toledo_ohio_cop_shooting.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415052/normal_5fee9c1c82204.pdfIn PDF document text
    • https://site-1176887.mozfiles.com/files/1176887/diaphoresis_means_in_medical.pdfIn PDF document text
    • https://site-1166676.mozfiles.com/files/1166676/ludubi.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/nulifiwid_raxajijoras_ninuvekuf.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/viloxoletesomo.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/lijulijowivaze/ncert_mathematics_book_for_class_10.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/kikaga.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/4267624364.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/80540821862.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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 5636 bytes
SHA-256: 5f34705cb310e6da82e1e94f97c2e9b97bcf4104ebfa699c4944cbf25e9f9243
font_01_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 10628 bytes
SHA-256: 296aafeadd40e63a0468f56347c57a3b0338c025502c38e53838137e8bd64574

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