Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fe5d8a365ff5f9…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 12:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e489993f91d3e5cbe0db9424e41c01e SHA-1: e5732e842b701869e38c7d513979ea29f982116b SHA-256: f1fe5d8a365ff5f9bcf9ee8e8993e32942b2125145a75afaf854c7c7738fe9ab
134 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate the execution of malicious code or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://catamma.ru/uplcv?utm_term=recorder+screen+apk+download PDF link annotation
    • http://nceed.kr/pds/userfiles/files/dasoxatilotov.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/nadogipotobesedefovala.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/70779988479.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90777406274.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/62165554958.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/87646418181.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/pedalefi.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/90626883719.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/df805c1d79a5efffee9e9212c198a4b1/wipasaredonawanunomivuwud.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/pojawawejotigi.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/romafilolomonuko.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/66759167896.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/siweb.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/milepopomutewa.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/43111069625.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210912054819724490.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/30895907241.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/gosexuzebijalimibaxe.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/wawomupuserepemolumiv.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210908155347479.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/78016419120.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_off0000ae71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE71 10540 bytes
SHA-256: 9489a2245f35bf273624f175f3e63b8cde241d07546f75bf269530de4c4830f9
font_01_sfnt_off0000c6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A2 15156 bytes
SHA-256: 6737b85ca9b49b1beef86718cf4ad82d73f7755867373c232970a3ec9bfcc1f3
font_02_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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