Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4580cfa12a7fbc…

MALICIOUS

PDF

71.2 KB Created: 2021-01-15 06:11:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4a1bf5be37c465b0227eeee4b1cb809a SHA-1: 9b492491937c4d2a4f00742c029781d0d00b7649 SHA-256: 5a4580cfa12a7fbcf468e97020c37696908a64abe931cdfeadaa1a19419ee340
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various platforms, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to direct users to potentially harmful content.

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://traffset.ru/aws?utm_term=coloring+math+worksheets+kindergarten PDF link annotation
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/fesaregekob.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/ViipExs/dead_trigger_2_pc_download_softonic.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/Z0AheOP/fosajiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496165/normal_5ff11864df067.pdfIn PDF document text
    • https://cdn.sqhk.co/jigidokasaga/3jfgh7e/12441652018.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/wheD34I/amazon_widget_android.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/4614748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444657/normal_5fa34d31994c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_5fd931b09cf31.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/iikdihh/virtual_piano_sheets_megalovania.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/mejifavo/modern_optical_engineering_4th.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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 5300 bytes
SHA-256: e191f5de57513d2ae6c20dda44b90bcdd363f5320180672a45bc6a981b29a6e9
font_01_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 10348 bytes
SHA-256: 5b465eb6e85c3827fe1cf67ce23c63eb3400a861a006cb77038b2106f227b4d9

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