Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc47971f1b41f706…

MALICIOUS

PDF

96.4 KB Created: 2020-11-09 22:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2ed2cce3d3935d3ef72828b1f0efd47a SHA-1: 1921f2b988f5fda5f0c6ccad5b530c37cef1db75 SHA-256: cc47971f1b41f7063b588347cb6a737368e5b75938f84027e808f1b64c91a4f0
164 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 point to PDF files hosted on file-sharing services, suggesting a link farm designed to host 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 links are indicative of a phishing lure, potentially leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?keyword=amoeba+sisters+worksheets+answer+key+bacteria PDF link annotation
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/77e2531.pdfIn PDF document text
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/9063542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f8abd8ce2448.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/820ee7ff7f3.pdfIn PDF document text
    • https://megeleju.weebly.com/uploads/1/3/4/3/134319984/46bf5e6f481742.pdfIn PDF document text
    • https://xosetumigex.weebly.com/uploads/1/3/4/3/134371377/773382.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/007dab4a8ed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_5fa4600f3e6b4.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/kagedatabujo/25603151529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/094017ee-1e81-468e-98af-3802f00251e2/wusipurodixenil.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/22931512835.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/98720254736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9971efba-23a3-48c0-afa0-3c7a44c15296/weber_grill_8006_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/7566540712.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_off0001301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 5184 bytes
SHA-256: fb45d6a699a3f2770af172d8731b952ec000348c89de0895cddaa271f1b73c94
font_01_sfnt_off000141a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A1 10724 bytes
SHA-256: 9bb0fbe082495b6543bddb26901f503e58301e00f0391b43a8e552391f879754
font_02_sfnt_off00016636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16636 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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