Malicious PDF — malware analysis report

Static analysis result for SHA-256 a244784a08aec9b9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 17:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b30c93a417b84865fd900158b14f8a82 SHA-1: be1a200308ff46539d89d44d8019e2d9de5804ed SHA-256: a244784a08aec9b986372899b0ca9c022879a2f0c5f6dcdeb41b3801a77a558d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=ethical+issues+in+secondary+research PDF link annotation
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/21890437431.pdfIn PDF document text
    • https://sambelteri.com/contents/files/rasimejupop.pdfIn PDF document text
    • http://shahgrp.com/uploads/sekimamoxepixerikizatu.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/57476349394.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f27aed18c---80306943785.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/disunite.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/7657626110.pdfIn PDF document text
    • http://jawarakreasi.com/file/97792413232.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/41565334075.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/82101621913.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/27580212723.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/rajotefiwuz.pdfIn PDF document text
    • http://fruitsad.pl/images/file/2726017820.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/50306569380.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/20171729005.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/51887983930.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/natumokiwag.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/2010575045.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210903074909_1193313252.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gotuwelomewakumobinixo.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/90564562607.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/sajoruxitorepamese.pdfIn PDF document text
    • http://liluby.com/upload/file/seguwofo.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021911132991521.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/nivagadaje.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_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 19076 bytes
SHA-256: 1ddf7affe02cb612a892e972d04ea682488eb95691dcf1a33e6ae7b1b28df6a2
font_01_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 10664 bytes
SHA-256: e5aeaf5e13f72d85d23d9b81ae53e800a2466aec68a14be38588ad342ff5ef71
font_02_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1