Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbec8593731adf6c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 06:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 570a50e037cab2b9370bad8209ea914a SHA-1: b71df5c23e82ee1c3c0e1719b51cc145a6ec6768 SHA-256: bbec8593731adf6cd00b31d6debc7034ead33c8ec25cbebeabba9aefadcb4d32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff66669599---20718524591.pdf In PDF document text
    • http://chafewyuok.handysociality.com/upload/files/lotutugikoralipetimuz.pdfIn PDF document text
    • http://isvpro.com/custom/files/zajajajavixitaniraxun.pdfIn PDF document text
    • https://riwg.in/userfiles/file/semasitogad.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/bapovul.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/sivijupalifesebigapofad.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/33759279158.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/gozoviditukosidodafe.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/xonijizefal.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/sibosek.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/zupapumevofugapili.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/ladazip.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130118156a95---timobibifuzun.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/13508337764.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/40107794664.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/74179131236.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/22257209975.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/35213230415.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/jajoripatav.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/petavovopilutotakesawux.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/xetedagugoleganijinopev.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/99213998419.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/jexagixudozugoser.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/56547943772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=eevee+wallpaper+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_off0000d261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD261 18096 bytes
SHA-256: 1395d4e4a3ddf00935e0c674fdaa93a1773afa2a8c24d1b2a4da581b6323040e
font_01_sfnt_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 10256 bytes
SHA-256: be4e42fafa58973c2d74e628afb305583955b14446546653d27ae5839ab08b56
font_02_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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