Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca22bcd2ee84f202…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 12:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08782e8a9551b61ea81846482513cc21 SHA-1: 839dbc5dcb6306828f19810b86f4d86cb8a82bdb SHA-256: ca22bcd2ee84f2028bab15f330d27e9efbea940fc5e5fdef4e26b3abd4a5a071
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=vidmate+2019+hd PDF link annotation
    • http://choragwica.pl/userfiles/file/27585976233.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021090617003073499.pdfIn PDF document text
    • http://technocom.pl/editor/file/2674941642.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/virapijipujoxexaz.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/49417581491.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/89342930694.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/41459887304.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/53013930642.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/48165823070.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/sovevul.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/34304465406.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/11377865266.pdfIn PDF document text
    • https://nevisnews.com/userfiles/vuzufewupabusutalunaz.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/nenekulejofepinipawude.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/zanemiket.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/dezuziganamipaguxe.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/8234920781.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/sagilivowenexaki.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/bumodubegifulurobe.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/viluzuberi.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/19440108155.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/wemefoneroz.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2a346713120c1e2eeb6fb33edfbc18da/zolubopas.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/46753004401.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_off0000c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 10408 bytes
SHA-256: 934cd01c59e768bb3dc9eaaf856e116d9c6b4977cfa5c598e8c158985f9118b9
font_01_sfnt_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 17124 bytes
SHA-256: 635a32ab231d1b3226651959f88c68cab01cd057350c6080c17f83793781791a
font_02_sfnt_off00010d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1