Malicious PDF — malware analysis report

Static analysis result for SHA-256 a095e563c1469c56…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 04:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 484a3dafb41db0c2c7d4ee5b2420ef09 SHA-1: 2a1d2737970cfe46a83a3a1424720ae1b8bd9ab1 SHA-256: a095e563c1469c5637e9647726fb810f1ca7edecf2a829f4257025e3f66df05e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://e-uchebnici.com/img/file/deveneralipotoxekukat.pdf In PDF document text
    • http://net-work.cz/data/file/49965909499.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/95052428305.pdfIn PDF document text
    • http://ledins.lv/cms/file/87299167163.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/setaderuwopubipabigabuvak.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2e90ba0fd---wuwumirug.pdfIn PDF document text
    • https://citytrafik.nu/images/file/92182550678.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/palufojid.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/gosutuwunoreme.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/mowuvopuganufanivi.pdfIn PDF document text
    • https://estoniapools.com/contents/files/gerobegi.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/57563186999.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/buxurokowaxasafezimofu.pdfIn PDF document text
    • https://latework.cz/soubory/92566762490.pdfIn PDF document text
    • https://armenia4d.com/contents/files/11720816723.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/21426021758.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/wodulowigatod.pdfIn PDF document text
    • http://dongphat.net/upload/files/kugarejapavej.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/zosimewedupesepa.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/misijejupikutij.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/botebi.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/turonabidudomibaro.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/57747430521.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210903120443.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/makeluvugatuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=attack+on+titans+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A0 10256 bytes
SHA-256: 17253b1ed700e2edd26eec25a8979ef1237a514a138746a7f9209d0e43b2c7f5
font_01_sfnt_off0000ccdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDD 17244 bytes
SHA-256: aa1577394101a746eea2bb08d9a442d9af6ec44218ffea53f8d075ace3ab9c5e
font_02_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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