Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5af968d6e6213b2…

MALICIOUS

PDF

72.4 KB Created: 2021-01-11 10:13:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 17e0ca94c34393b4bc5c8cd341b2da2f SHA-1: 9dc69b7d1e639176107daa05a8754bb32f133352 SHA-256: d5af968d6e6213b215a6bbae49498c7ff7a3d7b9db2d4305cf98dd766510d0be
164 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, characteristic of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=blank+business+card+template+a4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388427/normal_5ffbf6839d01f.pdfIn PDF document text
    • https://site-1178487.mozfiles.com/files/1178487/escala_de_balthazar_pancreatitis.pdfIn PDF document text
    • https://zedesaxaratok.weebly.com/uploads/1/3/4/7/134733302/4451103.pdfIn PDF document text
    • https://napuraviseso.weebly.com/uploads/1/3/4/3/134322211/tawejerafur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392199/normal_5fee7f3cb915d.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/sizovikobikale.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/zirojopemup/56789266588.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/wupezelulanafijilewafa.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/86272915783.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/able_to_extract_professional_9.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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 5560 bytes
SHA-256: 8114a074e3c81ad1ef79a01e888484322f72f8d6033c212fe9686c6b2f70f639
font_01_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 10700 bytes
SHA-256: 6031ee0c9803f23b603245b8eb2ee63e19ad792ffb598cc10a798b057f4f451b

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