Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f4c762e5beec7d…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 18:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b60ee0232e1c86b1cc18687bb6167635 SHA-1: e9934e88183ae682f33ed7047c4a60b98903c47b SHA-256: a8f4c762e5beec7d671ebfd4f6925548104b451634146e9615baa79e2a9a779b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to PDF files on distinct hosts, suggests a link farm designed to distribute further payloads. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates the document may attempt to execute commands, likely to download and run additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e9d69daa---56359752701.pdf In PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/gezupavaboluvifud.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/21406631720.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/61323869333.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/fudeziju.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/75937960326.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/riwoboge.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/figulaw.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/18685272.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/83520134305.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/18765989975.pdfIn PDF document text
    • https://cape-electronics.com/media/file/vewedofumulanasudetezi.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109182156036705.pdfIn macro / runtime command snippet
    • http://tienphat.vn/imagesflashupload/file/92357969671.pdfIn macro / runtime command snippet
    • http://ryanoomen.nl/uploadimages/files/maxugixudepibibu.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/pisatajunewediju.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210915115204.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/57661771562.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jepanazapabixala.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/kowasigumukoxibada.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/reridumagaz.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/dolebobijapatedesiv.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/94768395190.pdfIn PDF document text
    • http://cpils.com/userfiles/file/litokibu.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/zidufuwetusudiz.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/vodukanemidedepijirirewi.pdfIn PDF document text
    • https://cape-electronicIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pro+cam+app+for+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_off0000b83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 10336 bytes
SHA-256: 03bce7b32b4723fcde52949d3c34645762d5ae57cd59e984d5e2c38b6021d180
font_02_sfnt_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 16060 bytes
SHA-256: 2cb99f8b708f575776f5f556e988d75e3161b9a2482347dfdff2f984b9a407d0

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