Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7602b6b49b5e58…

MALICIOUS

PDF

92.6 KB Created: 2021-05-19 13:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 61829799aa0eba70e17f2e2356637509 SHA-1: 2cd6548303b44aacb9d7c95e8f87ee6e79d0a2cb SHA-256: de7602b6b49b5e58b461576d26039a47e013fc1678ae1ef4f181c95625203468
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=adjectives+exercises+with+answers+for+class+6 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368772/normal_5ffba74eac918.pdfIn PDF document text
    • https://femowoziso.weebly.com/uploads/1/3/1/3/131398515/tobalutuni-xazezoge-rokizagez-zipegol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_606487afa6379.pdfIn PDF document text
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/3838657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5fd11d13b4e53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_5fd9814626b0e.pdfIn PDF document text
    • https://pikiromubivi.weebly.com/uploads/1/3/0/7/130739210/7619217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_5fd678d68489f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495839/normal_60392bcfea777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474191/normal_603125aa0a9bc.pdfIn PDF document text
    • https://nafeziwubiwodi.weebly.com/uploads/1/3/1/3/131379183/9c0713c6bf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_60642cedc7dfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_60601a9894413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418786/normal_606aec187de35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372354/normal_5fe534f03f722.pdfIn PDF document text
    • https://satupagewamikim.weebly.com/uploads/1/3/4/5/134584558/xosuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/kubafezin/rokedesotibijevulanuz.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/bexaxi.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_off00011ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF8 5548 bytes
SHA-256: 2ff24c6acd6f6184cb1f37208766e814646c388b51e3efde0336701babc9fc17
font_01_sfnt_off000131f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 11572 bytes
SHA-256: 67abca6c9ccb018a3e94e498d80e78470e173de33a54919b066b7e24f24ea118
font_02_sfnt_off0001595e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595E 2824 bytes
SHA-256: e7a22e6ed21eafce1cfa388c96505c062b2169052a41d2e604f1289a965befdb

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