Malicious PDF — malware analysis report

Static analysis result for SHA-256 f603b51c9adc7727…

MALICIOUS

PDF

62.5 KB Created: 2020-11-10 08:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8690d73cdb9a221aeb514144d87d62c3 SHA-1: 9a141548942be3ce98e6e938643fa77784f2a757 SHA-256: f603b51c9adc7727119a7ec9251db4baf7f9339bcf36746b15ea51f8f45c3ea9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://traffnew.ru/strik?keyword=franklin+area+school+district+map PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5f8a49b5bce71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418781/normal_5f9853bd8fc82.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/guvararuxo_dudiwuwavugog_modugejal_lebudeliwoxaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452846/normal_5fa245a50eed6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f8f5bbbdd38c.pdfIn PDF document text
    • https://gefedotozowane.weebly.com/uploads/1/3/4/3/134395864/9f4d3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_5f8ef1904e72b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_5f9b616181c86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b950a5b-7f51-41f6-90db-9707a8cfdfa7/zixopili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b671a9-3f91-4ec4-bcf9-4de06821de13/xitijazojaxaxalite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd9d41b-3fa4-4fa9-b0b5-d17fde5eb204/5400072728.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/budaya_betawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9c1956-ec0a-423c-a3b9-8d9a5cf5b889/88237601298.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/uc_davis_box_sync.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB818 5332 bytes
SHA-256: ef09c7720528b57836a5f2d13535c673140f2f4b9adf9bbf2752ac117ddca3ac
font_01_sfnt_off0000ca0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0E 10308 bytes
SHA-256: 168a497dc24ff78d92f016f9a1e00b5cb6dc799bfc81a07554e93631f7063366

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