Malicious PDF — malware analysis report

Static analysis result for SHA-256 1597cf32e7611602…

MALICIOUS

PDF

66.4 KB Created: 2020-11-25 22:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 54a0d3802ded273c46ab86c089d34944 SHA-1: e9fab81e201863a7b2e275073a80ce56d3b57897 SHA-256: 1597cf32e7611602b2377cc1f280b216a27bd2c2f711fda6bb60587fc34f5b30
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm or phishing campaign. One of the embedded URLs, 'https://trafficel.ru/123?utm_term=graco+crib+to+toddler+bed', is a primary indicator of this malicious activity.

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://trafficel.ru/123?utm_term=graco+crib+to+toddler+bed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374181/normal_5f962a93add73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5f8b3f7e4eea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_5fa12d3793803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_5fbcb632e4c2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447464/normal_5fa73e3c7b8cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404738/normal_5fae4414248ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452593/normal_5fb86e5e32c1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450045/normal_5fbabb46b4607.pdfIn PDF document text
    • https://xazebalewez.weebly.com/uploads/1/3/4/7/134766000/2b2601baf.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/799aac2a-08fd-441f-91d9-56d7c94e9e42/23560657445.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/88161860080.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/34057654036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7bd8c0-a3fa-485a-a94d-44b28a013720/ejercicios_de_gimnasia_cerebral.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_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 4928 bytes
SHA-256: 942a149953cbfd3f07b799f0b9956b7404a64b890cedc2eb8f6f8746563eaf16
font_01_sfnt_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 10360 bytes
SHA-256: 113b54dd76477d65c26fb9d679e47956140025812e3480fe2d2eb304a0b3b8a6

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