Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadc5ae93eab9206…

MALICIOUS

PDF

69.3 KB Created: 2021-09-17 04:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25b3de7ee6941aebcad038a5dde6734e SHA-1: b1216439d5f6309846521e4b984de4fae1563036 SHA-256: dadc5ae93eab9206d0f256e525872467fe96a395da61e19eceaa12f7e11a9b2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malicious redirection scheme. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=privacy+focused+android+phone PDF link annotation
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/99747871639.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/15310069470.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///65487290065.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/sijabeterug.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/mazofovomaka.pdfIn PDF document text
    • https://designclarf.it/file/wabukabonoki.pdfIn PDF document text
    • http://esistore.de/userfiles/file/xinazasigejawikupokito.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/bijuzekafedoduxo.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/5844424487.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210911_78E94FBC83033281.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/62196343492.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/puguriramofijezowigefi.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea120f6bb---73178375953.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/76402510109.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/45940450591.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/71141001983.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/92413116897.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/vixegukogazejuxibipanaga.pdfIn PDF document text
    • https://cakkue.com/contents/files/binimevogi.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/96366307754.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/32000471061.pdfIn PDF document text
    • http://yuli-china.ru/d/files/galeritewisiwufomopolebal.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/49583837077.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e6b956ab446514c7f6a4bc3c21bc9534/pexiku.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_off0000b1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CC 10856 bytes
SHA-256: 2ebae3f869598e7215e696c8225d962b41a2f2b6005d485fe71a53341b828e51
font_01_sfnt_off0000cad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 14644 bytes
SHA-256: b65f5c7fd556708297b70c7737ff684b7fecb9e1e7bc2c7f6449d96d2853d8cd
font_02_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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