Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d172c5b3ffd964…

MALICIOUS

PDF

80.4 KB Created: 2021-06-02 17:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 414af8b843d321200c96d725f280ba05 SHA-1: 17f25ca22f768de33d603ee69122c24c2438fe05 SHA-256: 44d172c5b3ffd964a79e33ca779dbce25212a43f34d6a367bec299c6af6c2a6e
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, suggests a lure related to an 'acknowledgement receipt format'. The presence of numerous external URLs, many hosted on disposable domains, indicates a link farm designed to redirect users to malicious content, likely for phishing or further malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://zajinet.ru/123?utm_term=acknowledgement+receipt+format+for+rera PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499656/normal_5fe1818437da3.pdfIn PDF document text
    • https://xuzelakojit.weebly.com/uploads/1/3/4/5/134593048/8892796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_60213f057b536.pdfIn PDF document text
    • https://defutijobazaso.weebly.com/uploads/1/3/4/5/134587482/18867b6b96.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/43124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_5fd0f598d86fa.pdfIn PDF document text
    • https://xizukuzu.weebly.com/uploads/1/3/4/6/134606793/pirekikuni.pdfIn PDF document text
    • https://wiwoxedanin.weebly.com/uploads/1/3/4/0/134012493/zapitoratanezakez.pdfIn PDF document text
    • https://zokizepogu.weebly.com/uploads/1/3/4/0/134012569/c829e1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_606ea5fe9ee01.pdfIn PDF document text
    • https://fabidarupevonu.weebly.com/uploads/1/3/4/6/134620419/koris.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417221/normal_5fee32635a774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_605f7cfdd9a82.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/738b03aba06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5fef9f5a3e948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_602466c612a51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_6041cf16a24c6.pdfIn PDF document text
    • https://kixipebirivevex.weebly.com/uploads/1/3/0/7/130739750/kirewamebutudoxoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5fc9cf43d54a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rorazokazog.pbworks.com/f/kufedevekomapotidanemu.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/f/69117801643.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144499614/mcpe_one_block_skyblock_map_download.pdfIn PDF document text
    • http://xofitesu.pbworks.com/w/file/fetch/144447699/portfolio_templates_wordpress.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/f/jizidulifolop.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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 5228 bytes
SHA-256: 1a8f0ca94532bcebd538d552308fdc3f11f7e12b35d4bd1d400d7f41e12c0ba7
font_01_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 10736 bytes
SHA-256: f703f904046b9480aa776a0a23cfe8c583f66235d7d197f4baf291858713c5d9
font_02_sfnt_off00012621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12621 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361