Malicious PDF — malware analysis report

Static analysis result for SHA-256 197463527e1195e8…

MALICIOUS

PDF

71.4 KB Created: 2021-01-06 11:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 92e7b847db52329b74c7fdaca43cfe62 SHA-1: 98cbaf8dee12b3dd39a0a78a3d6e36eeb1a3d7f8 SHA-256: 197463527e1195e8238284b35fe9e50645c63e98971d4a23240b52f0d8aef3e7
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, many pointing to other PDFs, suggesting a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and extensive external linking are indicative of an attempt to redirect users to malicious sites, likely for payload delivery.

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://traffking.ru/aws?utm_term=printable+self+control+worksheets+for+elementary+students PDF link annotation
    • https://cdn.sqhk.co/mifimafonuku/ibjfhcg/overkill_elimination_song_meaning.pdfIn PDF document text
    • https://mupipuko.weebly.com/uploads/1/3/4/3/134370635/dijawefosaza.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/hf6Shdw/befezojezedolemujupom.pdfIn PDF document text
    • https://cdn.sqhk.co/moranunemuk/ieVeRji/1679810392.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/ihaBjjh/werere.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/bifamomove/duke_bike_png_images.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/economics_new_classical_versus_neoclassical_frameworks.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/acido_sulfurico_usos_y_aplicaciones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5457e515-876d-4aea-8e53-8e5c843655c7/43973724749.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/58364407631.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/appium_inspector_for_android_on_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/jekeku.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/amritsar_golden_temple_video.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/free_copy_of_the_compound_s_a_bodeen.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_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 5660 bytes
SHA-256: 6ce8a47f0098c94d21073576a798ba36c75089e74609bfc6402da5a8da84c26e
font_01_sfnt_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 10604 bytes
SHA-256: b71256d522bc27216c7e9df5841f53f82033f8f0706c30a5ff855c98c144b542

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