Malicious PDF — malware analysis report

Static analysis result for SHA-256 293b80362fc66ae0…

MALICIOUS

PDF

80.5 KB Created: 2021-02-12 01:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1e6d3fee7534fa0f0f627ea4de95db2b SHA-1: d009e238a12c1eefea7ecc2cdd9a5a4a5f76039c SHA-256: 293b80362fc66ae00f5acfddfc03184b5d55c1c425aa37adbfaa3f55b8abe399
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with a critical heuristic flagging it as a brand-impersonation credential phishing lure for Norton, directing users to a Weebly-hosted redirector. The embedded URLs and the overall structure suggest an attempt to lure users into clicking malicious links, likely to harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/77030ba1041dcde.pdf.
  • 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://jacksth.ru/123?utm_term=cyberpatriot+ubuntu+checklist+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405662/normal_5fe8407077db3.pdfIn PDF document text
    • http://sefobadivura.iblogger.org/lancet_diabetes_and_endocrinology_author_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_60119240f0ba4.pdfIn PDF document text
    • https://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/77030ba1041dcde.pdfIn PDF document text
    • https://romenugerod.weebly.com/uploads/1/3/5/3/135317494/lexoka-bizako.pdfIn PDF document text
    • https://kexowepapu.weebly.com/uploads/1/3/2/8/132815076/4419784.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/ThbjeX1/69540131013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_601458c91ae8a.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/bebasovijap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ledojiwibobuva.rf.gd/spontaneous_bacterial_peritonitis_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/metformin_bnf_pcos.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/74729359111.pdfIn PDF document text
    • http://tesunujazo.epizy.com/29913373630.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/jegumanuvavujip.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/56831959380.pdfIn PDF document text
    • http://vekoxoke.epizy.com/97240762056.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/neworadexunexana.pdfIn PDF document text
    • http://fuvituze.epizy.com/bluejeans_events_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/american_airlines_pilot_uniform_pants.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/scoundrel_guide_gloomhaven.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011046.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11046 21168 bytes
SHA-256: c23afdcdee34f9b40d93f46cd4d376352f86d7f31d5209a7346455dc6cd3dde3
font_00_sfnt_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 5452 bytes
SHA-256: 56c09b7adcb7517d2f4d6258be55932ea7e112ba3d1db3636ee2ff2756eb7ece
font_01_sfnt_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 10728 bytes
SHA-256: f7de6754d8c1cfa3d6e1f57cc5cc9133680be4628508532a25e05ed6165caf6c

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