Malicious PDF — malware analysis report

Static analysis result for SHA-256 4713b8d326a5e13f…

MALICIOUS

PDF

71.5 KB Created: 2021-02-16 18:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5c2cfbb45aa0432e63503a2e7d5518a0 SHA-1: 853f8603710a41924010d1bc979696ad93bde1c8 SHA-256: 4713b8d326a5e13f63602e1c51ea146aa5e55b1de3a41465aa6fe444a2e08ca5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, indicating a likely attempt to distribute malicious content or phish for credentials. The document body, though heavily obfuscated, contains references to 'Google maps games' and application metadata, suggesting a lure to a fake service.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://crophysi.ru/wix?keyword=google+maps+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498868/normal_5fda818cd40bc.pdfIn PDF document text
    • https://sesoguxanijiba.weebly.com/uploads/1/3/5/3/135309487/7543806.pdfIn PDF document text
    • https://kanexunife.weebly.com/uploads/1/3/2/6/132681916/notazupen.pdfIn PDF document text
    • https://tugojomabam.weebly.com/uploads/1/3/4/5/134588125/ab4bd532a.pdfIn PDF document text
    • https://cdn.sqhk.co/mekerijiwuv/iahjzhd/vugawiredewozegubapodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454673/normal_600b2041ebe19.pdfIn PDF document text
    • http://xitnet.fun/appa_emotional_songs_in_tamilzwv0w.pdfIn PDF document text
    • http://fridgeservice.ru/biceps_clicker_ofglapkn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_602b948051dcb.pdfIn PDF document text
    • http://fitness-ital.fun/finger_labyrinthgzwl0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369190/normal_600202322db75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5ffec3ff58688.pdfIn PDF document text
    • http://taygerr.com/63729812866xekoi.pdfIn PDF document text
    • http://xplaintome.ru/72614215368b2kl5.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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 5076 bytes
SHA-256: 28854f3a1d9d0d7dc4cab4f80509f1b9ce8f9fd479e08443834b50ef19a3da06
font_01_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 10136 bytes
SHA-256: 233886754b99d4ca890689f1d62a7b906c51c73138a2cf7b3c35118154d15689

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