Malicious PDF — malware analysis report

Static analysis result for SHA-256 929e6f99a92dc75e…

MALICIOUS

PDF

86.3 KB Created: 2021-09-10 18:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 713976acc3867fca1459fd5c9bbc47b4 SHA-1: b6fef7858c17b01de5776df4d26fc1097d03a997 SHA-256: 929e6f99a92dc75eb969d6c98cc71f078a7c3ff6d3c59f6183dc107c85b8dc3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=tanpura+droid+for+laptop PDF link annotation
    • http://greenearthgardens.org/userfiles/30238039825.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/58484753856.pdfIn PDF document text
    • http://cbstav.cz/file/mokugi.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/88360382993.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/zodefifegitipipi.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/71713894030.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/94847419699.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/fezajimododalukupuwokoke.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/5349891423.pdfIn PDF document text
    • http://hueide.com/upload/files/gipupikozutaxovixofojisi.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/nanejofope.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/49207207871.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/jawusuguz.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/nojas.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/lomuliduzajadupizirej.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fff1d7dd3---zixijigux.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a4aa026e11ced4fceef33b6055a30b16/39418680452.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/jijusisasafatevorira.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/lodekebumokakosekisuv.pdfIn PDF document text
    • http://stefani.cz/fck/file/newasunigowotulixor.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/73058130638.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/28672055299.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/rudexelijamow.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vumetojexonobonufo.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://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_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 19480 bytes
SHA-256: 271458661d758038cdb7165148ed53c28ad96b78f140f1c9d873a6d97d1fd49f
font_01_sfnt_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13432 10256 bytes
SHA-256: b09189bc98761d9a7b0734e0130b138c5b58701cfce493efd954da1b9af8fc20

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