Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b63309c1d0b240f…

MALICIOUS

PDF

68.8 KB Created: 2021-02-21 02:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: be3dfefc3103276d02e3098ca0e5d74a SHA-1: 723af5a955686d79f9f0ed9a77e8855493957b83 SHA-256: 7b63309c1d0b240f0305bf826251b5c8aafc107337ca56e384fa2c1048a01e01
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a likely attempt to download or redirect to malicious content.

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://leonvi.ru/strik?utm_term=us+steel+imports+by+country+2017 PDF link annotation
    • http://getsol.xyz/kado_the_right_answer_last_episodefbq40.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/6576283.pdfIn PDF document text
    • http://pl50off.info/which_country_has_the_highest_income_per_personmrzew.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/948457064174ypwo.pdfIn PDF document text
    • https://semizomemakov.weebly.com/uploads/1/3/0/7/130739936/d54320cc0cacee8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462694/normal_600170f5f02db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494893/normal_5fcf47e2f2060.pdfIn PDF document text
    • http://proflist-briansk.ru/flipped_book_theme3kxdq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5ff7e238e2c59.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/fEWToEu/xinarumeme.pdfIn PDF document text
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/e5117a2f.pdfIn PDF document text
    • https://natadafupekex.weebly.com/uploads/1/3/1/8/131856288/jaxinefobobizid_manuzav_dakafuzexi.pdfIn PDF document text
    • https://cdn.sqhk.co/zubixola/jidihQL/zepedabagolidapemanaruwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477651/normal_5ff877198f4f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC2 5508 bytes
SHA-256: d6abce185a7a780a9378ec809306cef592dfe10783a4ed8caa764b8570ab5cd9
font_01_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 10988 bytes
SHA-256: 44f7b7d8d6ee9da2461c44ff47b0134f8a83915be95aefc326ce12b792b80d6f

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