Malicious PDF — malware analysis report

Static analysis result for SHA-256 692638fb3821621e…

MALICIOUS

PDF

76.2 KB Created: 2020-11-13 21:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cdd30597427913b25c491ed4707529f7 SHA-1: a9bc3df3d62ffde7f355d1e35847dbf3f4ff71d3 SHA-256: 692638fb3821621ed87ea1801dfe85d1a46084a644ea3d75536b2f86aed6682b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing or trojan. The presence of embedded URLs and the overall structure point towards a phishing attack leveraging a document as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafffi.ru/123?utm_term=paragon+partition+manager PDF link annotation
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/tapefaresavovu_jugowuzapasi_bixulabidapek.pdfIn PDF document text
    • https://xudaxeja.weebly.com/uploads/1/3/4/3/134339900/3661056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5fa9002e9bce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5fa730279ef8e.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/webaz_xaxuxubigidezop_lotaduvupala_bisovexowidogir.pdfIn PDF document text
    • https://fuwurugosudopo.weebly.com/uploads/1/3/4/3/134326966/bevofogafaje_wijixolebosifez_jorotinepeviz_ravefigos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5f8df65dd02a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_5fa5db7cea0a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_5fae1120dd7db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b03140d-0862-4df9-9863-5e46d2c98bdc/13841553693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b38c1c-4959-48ca-929a-de883fd99a51/steel_and_flesh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9a156c-a502-4cf9-831e-d7f3fcf05506/babovi.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/leopard_gecko_pet_care_sheet.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_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 4928 bytes
SHA-256: bc05b8dc95c15765a2911ed19cbe34230d186da962d648dc42eafcc9520ea4b2
font_01_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 11764 bytes
SHA-256: b6c080c930abb79222dee5595d0ec472897c07b5a0f6296307158da967f55697
font_02_sfnt_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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