Malicious PDF — malware analysis report

Static analysis result for SHA-256 321d8ad36eb54212…

MALICIOUS

PDF

69.5 KB Created: 2021-02-21 06:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bb14232e101b69ca7926213efb7593a8 SHA-1: ce8b3cc312b7970aae71664cee257a0c4564a503 SHA-256: 321d8ad36eb54212b2b2a88f789c2406b6b47034a68a72d8e68728ba9ce7605f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan threat. The embedded URL and the document body's reference to installing HP printer drivers suggest a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=install+hp+deskjet+2132+scanner PDF link annotation
    • https://bixaguvukimub.weebly.com/uploads/1/3/1/8/131872105/b5b4da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387242/normal_5ff57ed1665f4.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/7189930.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426062/normal_6001558db2bf1.pdfIn PDF document text
    • https://verumoxozuvije.weebly.com/uploads/1/3/1/4/131407377/1aab1464a.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/dekogamik/canzoni_scout.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/rowozudeg.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/89793804793.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/wulovut.pdfIn PDF document text
    • http://nulesuli.epizy.com/wrong_turn_4_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/free_ccat_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/pekixakoxinexozo.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/clark_c500-40_forklift_parts.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_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 5584 bytes
SHA-256: 42ead4ec1491c0d9ee5a9f175d752d1809ffdd87a89999be9f31ac9bcf95537a
font_01_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 11272 bytes
SHA-256: c1ab3b2a15f646dcb41676697b4397f8fbef02abf105ced4581e8daa880aa527

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