Malicious PDF — malware analysis report

Static analysis result for SHA-256 6823ee71a2c2c82c…

MALICIOUS

PDF

94.5 KB Created: 2021-09-08 21:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0b1c14f7bcdb81ecdbe9db27e5646ae9 SHA-1: fdff6d1b3d8cdb4cb77d5fdd5c7bb490d76d8f1b SHA-256: 6823ee71a2c2c82c8046e30138eb1c310c46740d61a14330ea4e999127296376
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://onlytech-tunisie.com/userfiles/file/jujidelumivugujotovugufut.pdf In PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/93775655444.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/24668813157.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-6/20210906033650853875.pdfIn PDF document text
    • https://x-software.cz/data/file/ropixexojoxanamojog.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/voloxuvodarunodi.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/26311251348.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/fibunedobapuvedelipodiju.pdfIn PDF document text
    • http://www.heksan.com.pl/file/ginitop.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/884cea.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/18900948281.pdfIn PDF document text
    • https://ka-base.no/images_content/file/zefatumuv.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/mubasusopuvenemudopaz.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/89929357760.pdfIn PDF document text
    • http://thedreams.cz/files/57498650682.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/86016946653.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-1/20210901075125499531.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5b52b37b---vusaxajidutufeva.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/46347757151.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/fanefebaxibutanonabofo.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/rugamozizadijikugatoxifa.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/porozisezasiwatafeka.pdfIn PDF document text
    • http://hk-keber.de/images/file/sufofiramutegoxi.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/lusuxobimesitefonavuxonir.pdfIn PDF document text
    • https://raljob.com/userfiles/file/lekoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=use+the+figure+to+write+and+solve+an+equation+for+xPDF 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_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 11140 bytes
SHA-256: 4f9b090f9eb8a662624fa73f328e8a762608fb2ae5aa910dac0b0f4d4ad6da58
font_01_sfnt_off00011f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001373c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373C 20048 bytes
SHA-256: b7da3d67af24d077a53d90614c67461e87d54ab84fcf842f1a462b63ba492401