Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfeeb37f500b44f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 09:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f810738297f74a579f91649acf0f5521 SHA-1: 81729e54c3ace6dc6d29f010214e54dbfff2c708 SHA-256: 2bfeeb37f500b44f3f1718a3590d4cd3be1e94812c1e7893399320346d91f6d9
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to other PDF files hosted on distinct domains, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a non-legitimate purpose, likely to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.brickchamber.com/ckfinder/userfiles/files/95895677574.pdf In PDF document text
    • http://klawiatury-foliowe.pl/_data/file/5856874414.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/jebavigixi.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/41941399641.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/mijewazazudama.pdfIn PDF document text
    • http://protok.pro/upload/files/mesavabonimowanufikolaju.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/13031801175.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/81931176160.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0bf79ad424cc66153dba1761e5e52642/45020355324.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2965c2124160231a702a57240aa7e900/86206638581.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/56324387889.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/lenazifefiwakurudimeze.pdfIn PDF document text
    • http://nemalipics.com/kakisezukebakajetevigoruv.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/limarem.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/piwuxowugida.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/segeb.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/81341695254.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/43307975652.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/34059808292.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/garonavebezodibax.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/gumutagukat.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/vivijotivafimuni.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/14904765487.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210917170409.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/jogokesenefidaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+check+android+imei+numberPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/62306074934.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/majobefigo.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_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 10832 bytes
SHA-256: 147d6539a5a66ca38f9c967ca98450d236c0700b36fb91e94404b1af82d6899d
font_02_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 16600 bytes
SHA-256: 2682f3da4480282bc894eb6a083ad42c4494473ff9c06b3d75f1baaf6676d270