Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ecb8d5b122f007…

MALICIOUS

PDF

77.0 KB Created: 2021-01-28 05:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c0ff294dadd3c4b15c27a70b92fb05ad SHA-1: 00db3812bd8e8d5350740b445552a6cf87913288 SHA-256: 44ecb8d5b122f007dd08457aed15d5e7e15239857a28e232d8e185b93507366e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=sbl+hebrew+keyboard+layout PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484624/normal_60016a3d70104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416675/normal_5ffff2b47c31b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491671/normal_5fc6b71e8fac2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367687/normal_5fe00cc4075dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465396/normal_5ff66042a5f01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455377/normal_5fdfcb7dacade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477910/normal_6004519de261b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_600f381b5e0ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470542/normal_5fdb9035c52de.pdfIn PDF document text
    • https://benarejara.weebly.com/uploads/1/3/1/4/131407695/tepomezifadigiso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452593/normal_5ff297fa770de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fatikonavori/cydia_ipad_9._3._5.pdfIn PDF document text
    • http://panafinuniro.epizy.com/posojepibivugelubeliru.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/state_of_florida_warranty_deed_form.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/fudofivudajajoj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 4964 bytes
SHA-256: abb29bcde973d1edc21f1b6b3ea056133ae068bd7c2bd04c1a59c58f0395dc44
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 12480 bytes
SHA-256: 26ba856027764e94f4ca30128b08773645fcbd4244ac2461951ef37bbff8e404
font_02_sfnt_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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