Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9ac06bd1f3ea45…

MALICIOUS

PDF

78.7 KB Created: 2021-06-07 20:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f98cc62b94732703221fad01da2963d8 SHA-1: c464513718c366dc7995ad2b1c601ce393f460ab SHA-256: ac9ac06bd1f3ea45f50fd3458a487f2f17428d8e274460c4e1c97f33e025c6ac
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL leading to a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'English grammar question paper for class 4 pdf'. No scripts were extracted, but the presence of multiple external URIs and the link farm heuristic indicate a phishing 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://cructi.ru/pbw?utm_term=english+grammar+question+paper+for+class+4+pdf
    • https://cdn-cms.f-static.net/uploads/4500911/normal_604f9fb587dbd.pdf
    • https://cdn-cms.f-static.net/uploads/4471250/normal_603256c4d4aa1.pdf
    • https://cdn-cms.f-static.net/uploads/4376878/normal_6022c48b04021.pdf
    • https://static.s123-cdn-static.com/uploads/4417644/normal_5ffd546f7628f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/02869c4f-48e5-4d3c-a1fe-3c52aec1cfbf/geduragamomelusuwexavi.pdf
    • http://kibumezi.pbworks.com/w/file/fetch/144479820/roluxuwusoju.pdf
    • http://mutoteja.pbworks.com/w/file/fetch/144505935/nazomokunitimadepu.pdf
    • http://sovafiben.pbworks.com/f/kerovukasudisotokubomepaz.pdf
    • http://naxenuve.pbworks.com/f/96347075845.pdf
    • http://xofitesu.pbworks.com/w/file/fetch/144439707/begoram.pdf
    • http://tukufidanega.pbworks.com/w/file/fetch/144717534/libros_de_electromecnica_de_vehculos_grado_medio.pdf
    • http://mevuteled.pbworks.com/w/file/fetch/144569148/kannana_kanne_female_version_mp3_download.pdf
    • http://vikowezanipe.pbworks.com/w/file/fetch/144506439/85147308792.pdf
    • http://xuvabufoj.pbworks.com/w/file/fetch/144727296/73233493173.pdf
    • https://uploads.strikinglycdn.com/files/f07f8374-51cd-45f2-9d5a-9f58fbb42e58/best_selenium_tutorial_on_udemy.pdf
    • http://gazumadu.pbworks.com/f/xobidosijusukiwebifuleno.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f2.bin
d98409bc5971cddfb749e58cab5728f531c4db296bdedb696b11104399ed2a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 5740 bytes
font_01_sfnt_off00010753.bin
32bd30d32a8ba982e9d0d9019d37002a55047e0eb4c62f21e5359442d29184d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 11348 bytes

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