Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31dfdaec9c18fd5…

MALICIOUS

PDF

77.9 KB Created: 2021-09-14 07:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ab593ac5b99b1a626b2d0194dfb6d95 SHA-1: a4a90b0da647b63ce7223c604f9a1da8af37ea9d SHA-256: d31dfdaec9c18fd5921cc12fda24aee989d192b98115a8ce2b149092e225b5e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous unknown URLs points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://altaprecision.com/userfiles/file/dogixarovujoser.pdf In PDF document text
    • https://didacostruzioni.it/userfiles/file/ziragov.pdfIn PDF document text
    • https://phunhai.net/upload/files/tejefut.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/54492706518.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/nokiribikon.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/38532167934.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/vopufepufurisitopufuduxo.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/15555208176135fcd4a827d.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/nadagojosukibedu.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/41838247490.pdfIn PDF document text
    • https://maturana.cl/upload/file/62312011325.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6138b9aa89574.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/bupesidelut.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/ditedimakuloxamuvapifi.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/bizumelevobunadiw.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/jefomitomimubisekusenib.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/kofexoregovipegiwogiguzo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9gav627m91b4sd02mvg57ripdg/27697933871.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/pajaxaburalaruk.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109041159464159.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109081457555327.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/sejipoxapoteranabubosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=game+center+app+download+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_off0000ca7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7E 10632 bytes
SHA-256: 0de06636c4848ab5b36ce0309c58f29296ce3de29267ce09de7531f77cc5800e
font_01_sfnt_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 18416 bytes
SHA-256: 12832bbe5f582cd0329f46ec6c6876c427c3ff905dc0ab49b6c52fa0ef865331
font_02_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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