Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e345e857b2f359f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-21 15:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20f0edb9edd7370c48a98cc050d47f5f SHA-1: 8b904a17ea49efb8cf0dbfe609f3ef974bca161d SHA-256: 3e345e857b2f359f06eab93c5c35cf635a18a04b7678ddde8f0a7453905718d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The primary URL identified is part of a redirection chain, likely leading to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://renknh.com/ckupload/files/wuwemuzifovojaju.pdf In PDF document text
    • http://gursakaryahukuk.com/images/file/18800107215.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141f02312dd6---savoxidezineveviteb.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/setuwupoja.pdfIn PDF document text
    • http://lachina.cn/upload/file/4510678403.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/ruvet.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/53879533947.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/80227595125.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/22557872445.pdfIn PDF document text
    • http://banquat.com/userfiles/files/54348539535.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/82594728694.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/luxukizipijagovuviwemasub.pdfIn PDF document text
    • http://healthywithhart.com/res/file/ludepagajujefigozagadawab.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/10921182902.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/nuxegizilifizisugez.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/dovigetifafifovuludubaba.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/ridisasikapesi.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/mokulefugosiperetudetemeb.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210913065605.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/68774573575.pdfIn PDF document text
    • https://edgecs.com/documents/54641000914.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/ratememozekevixawadugino.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/14843101360.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419d81bb826---kiralokezemazatojajonijis.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/fogata.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/jiwimej.pdfIn PDF document text
    • https://ptogel1.com/contents/files/92874535219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+app+to+download+any+moviePDF 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_off0000bc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7D 17088 bytes
SHA-256: 324fac8deb7bba8d9b1ee494b00e2d90b718d9ac8dce8f2968a97dc7db93fd06
font_01_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 10772 bytes
SHA-256: e6d6ff2369b98cc20dac4b644db091cc2743aa8beaff3b6ab4dff3b08b4a8be4