Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bb1be8e79c1b12…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 02:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 660673928cd62c6c758f1a67c6e71147 SHA-1: 80ca88a34c1e780c15298f0006fa54091ccf0008 SHA-256: a7bb1be8e79c1b1216ded369ece92dfc1ff55999805f38bae47ea9396ff27102
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://archism.ru/uplcv?utm_term=create+shortcut+to+file+android PDF link annotation
    • https://prosaison.fr/userfiles/files/nositaxebowa.pdfIn PDF document text
    • http://stringladies.cz/userfiles/muxenebabafulakokizomoba.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/wewerowulewifexazipu.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72145331247.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/notesunisuwitakizatagef.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/84241678111.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/lojexel.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/paviresumemikopusozi.pdfIn PDF document text
    • https://10fci.org/userfiles/file/71462896613.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/fajixam.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/52944882031.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/jogum.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/pikidenene.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_2FAEDA3A13BD5269.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/nusolojuzixedalaxi.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/37326880996.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/77377303869.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/pasarasumokuvedijitowebam.pdfIn PDF document text
    • https://digireg.ru/upload/wozimonaluzod.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/gikevog.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/nuvodimeb.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/60472327364.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/22080446616.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d9aa06c4e375e6a20f761febdb1f4762/sakotuj.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/sagozafekakapibepijuvu.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/86107939470.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b133347760---jopawasipowefawezekeku.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/67906332263.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_off0000c399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC399 15416 bytes
SHA-256: c8e628e3a34142d3383372966d64a59fe959666c765724bc6adf96191204110b
font_01_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 10704 bytes
SHA-256: ba5a609f3312d2d0676b2fcd44a4ef574b7d7be23eaf0a7da81ed0e0109bec47