Malicious PDF — malware analysis report

Static analysis result for SHA-256 651e6eb4b955685e…

MALICIOUS

PDF

73.6 KB Created: 2021-02-15 17:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a91f642774e4fbe7e19427bc4609ffef SHA-1: 6005bf375c5e0f272d7b3d09973df92989af0578 SHA-256: 651e6eb4b955685e018640d3518415eefa2975cfe3d169a8a7fb356efb51c5c6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=area+and+perimeter+of+trapezoids+worksheet+math+drills PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401559/normal_6016492a19006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368221/normal_60077a5e2d865.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/36a1998e5717f.pdfIn PDF document text
    • https://kipopedetazezu.weebly.com/uploads/1/3/0/7/130775623/9d6350c58e2449d.pdfIn PDF document text
    • https://togawakavepanef.weebly.com/uploads/1/3/1/1/131163752/bulekujumet.pdfIn PDF document text
    • https://suterigegopos.weebly.com/uploads/1/3/2/6/132695321/kufexus.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/fekafugologalevoreku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457604/normal_5fcea502a585a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458150/normal_5fe36a1ae3375.pdfIn PDF document text
    • https://jafelabuz.weebly.com/uploads/1/3/1/3/131398525/bosijemidigek-bapupapilofem-rurijisoziw-roxalibu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fcf3780b7b52.pdfIn PDF document text
    • https://pavofadibap.weebly.com/uploads/1/3/4/3/134370944/bf165d3f2242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_60177e8b4aa33.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/kozexuwil.pdfIn PDF document text
    • https://jenafowumavadas.weebly.com/uploads/1/3/1/4/131437472/tugokobakuw-bovijotajodulaz-berak.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/benubapopikaj/novejikiroguwurajoxez.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/36547427250.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/ligetarufa.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/anaesthesia_tutorial_of_the_week.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/gujitemametujoxonebazokot.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/cyanogenmod_13_for_yureka.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/20789206557.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_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 5476 bytes
SHA-256: d276dc037c08c14ad076f38fa629d1136cc7cd17421a2e9db2e9b03b5c283c6a
font_01_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 10080 bytes
SHA-256: 827f56f7786289b91b33a277854b5c0679ee516081d844000b071410161368f5

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