Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce92d3b243c754e7…

MALICIOUS

PDF

67.9 KB Created: 2021-09-12 10:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: faebadcff5125287d456b50d064150ad SHA-1: 1e2f2b0f169a91a16b6517bf8fae567736b27ed4 SHA-256: ce92d3b243c754e7761865a9db9dcf50e8a802dcb04a49b21ad0f744d7b5c165
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing multiple external URIs. The heuristic 'PDF_IMAGE_LURE' specifically indicates a screenshot-like appearance designed to trick users into clicking. The presence of numerous links, many pointing to disposable hosting or using UTM parameters, further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=nova+linguagem+android PDF link annotation
    • http://fzsvybbs.at/userfiles/file/gewas.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/novukovesele.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/pekaforuza.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/misupisuniput.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/lidoberikobimetexefa.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/jumosikilizebevumojed.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/50115162340.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/70454733006.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/jikizafidotisusuza.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/80154554129.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/58237467536.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zadusikosemegifijibejekuk.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/nanadamam.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/negolaxoxivexatirewu.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96975910156.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137362119952---rigunomejata.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210906092848186493tcdoo.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/33592164281.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/137272607.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/40328819169.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/tuzokonelari.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb251eeb44---74265489190.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_off0000b033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB033 13848 bytes
SHA-256: 2ce66a92f8bce83d0da73715bfab768156002ecdf37eadf68a2789dcbeceb80f
font_01_sfnt_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 10468 bytes
SHA-256: 99ab5c87a6e15df43a134e78bebf325602afcafe300d8407c5056533acd6e744