Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f73fa5369baecd8…

MALICIOUS

PDF

84.3 KB Created: 2021-03-02 07:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cd39d4ff3a24220a03227a3da2b2b265 SHA-1: 2299db78236fa93828002e8278f4ac2ef98639b4 SHA-256: 1f73fa5369baecd839d804d39c4504d0a3c2b03e5828a3f97834b6769234c9f8
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 as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

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 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://nipisod.ru/strik?utm_term=robin+hood+film+castle PDF link annotation
    • http://seplafond.xyz/dubitukamaritokokipogizam2m6a.pdfIn PDF document text
    • https://jamojibo.weebly.com/uploads/1/3/5/3/135349767/7197235.pdfIn PDF document text
    • https://seporarutigofu.weebly.com/uploads/1/3/2/7/132741198/4009594.pdfIn PDF document text
    • http://nuvotana.22web.org/amharic_keyboard_for_android_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381104/normal_5ffd0098199cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381751/normal_5ff71a457c204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5ffe4cac7a0df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_600f553d21b0b.pdfIn PDF document text
    • http://naturebiolog.fun/neselokigevabakeltcaqf.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/bumedovifujovo.pdfIn PDF document text
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/caec9ebe0e2226.pdfIn PDF document text
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/1593352.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/learn_hindi_books_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://romulomejalu.rf.gd/what_is_the_self-efficacy_theory_and_how_self-efficacy_can_be_increased.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/zukuridorirerulamarubopu.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/full_metal_jacket_monologue_script.pdfIn PDF document text
    • http://lazumibuwa.rf.gd/50101639831.pdfIn PDF document text
    • http://givimuvupavu.epizy.com/54326174438.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_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 5312 bytes
SHA-256: c0cd6ab2355656f27fb052552ac957de7b304b6728431b3971e30bf64dd4d3ea
font_01_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 11504 bytes
SHA-256: 5ebb4f375c7b3682e2db31c3a555595f4d6cc07cb83eee0ada6409de9282b7b2

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