Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e6b22d02517a8c…

MALICIOUS

PDF

98.9 KB Created: 2021-09-24 09:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d841d8dea8ebbb7931a6f877c4f7d24a SHA-1: 22d0d47b8988cad46f41585004ef864f8f46a6f0 SHA-256: d1e6b22d02517a8c35c6eb50a3b5b6956e275fde524eed13a41c4d2ff83d0964
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links to other PDFs hosted on various domains, many of which appear to be disposable or low-reputation. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates this is a link farm designed to attract users through search engines. ClamAV detection and ML classification strongly suggest malicious intent, likely to deliver further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ncfc.com.tr/ckfinder/userfiles/files/38344507891.pdf
    • http://www.agenbenangbandung.net/file/fifafigazuwoka.pdf
    • http://tolltisztitas.eu/userfiles/files/55533851441.pdf
    • http://dtmaso.com/public_html/Imagens/file/99116073522.pdf
    • https://chongtham68.com/app/webroot/uploads/files/92752582696.pdf
    • https://karlholmbygg.se/UserFiles/files/rogojeruxadoxatoxok.pdf
    • https://soudurelauziere.ca/upload/editor/file/53626978931.pdf
    • http://myappartement.de/web/editor/files/dasoxewibu.pdf
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/risodel.pdf
    • https://groupunsur2.com/contents/files/21127392541.pdf
    • https://mmoxx.mn/userfiles/files/golamiropokinapamoduwipa.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ad671b5ec74f4dddfd4dba487fe867b4/wezoridepuxuxiwajalazikak.pdf
    • http://cyuanmei.com/userfiles/file/vebidoz.pdf
    • http://gurolmumcu.com/userfiles/file/saxasoliruwu.pdf
    • http://3xlove.com/uploadfile/file/1769734800.pdf
    • http://aatmicscience.org/asuserfiles/file/kikexuxafaton.pdf
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/10583204422.pdf
    • http://kondicionery-lobnya.ru/upload_picture/file/51484592743.pdf
    • https://letajicikoberce.cz/userfiles/file/81424634090.pdf
    • http://pi-consulting.ch/download/kokozenitunujunenukux.pdf
    • http://konakelektrik.com/userfiles/file/14086910497.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ad87c90ff---pojogexijakigaseruru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+developer+jobs+in+surat
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011908.bin
3c13bcdbe758217636270b746fd762c8277963043bfb47492721ed0c55309084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 10804 bytes
font_01_sfnt_off000131c8.bin
bbe571805da144c4fa54f3f6cee56a93309c8e8ceb9fab0c39be29579c9d0539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131C8 20052 bytes
font_02_sfnt_off0001660f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1660F 16792 bytes

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