Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcbd88295417c60…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 05:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc8fa2dc5d19218c412fbbb4b6a750cf SHA-1: 142e6abc72e74f22c3a60f3d2ac5bbdc3243c1fa SHA-256: dbcbd88295417c60c3fdfe20c455ff4b9d774eceec18dbe8756a1b1770d1a791
206 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a social engineering attack (ClickFix). It contains multiple links to external PDF files hosted on various domains, suggesting it acts as a downloader or redirector. The heuristic 'PDF_RANDOM_URL_LINK' specifically points to a suspicious PDF URL, indicating a likely attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dbb366db7ab7dc523955d105f68f6a8e/rivexesamazewejat.pdf In PDF document text
    • http://owv-sad.de/userfiles/files/gokunosowebanedeko.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210907_e11f1.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/numezaronevixipatos.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/41851163798.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/xoxawudi.pdfIn PDF document text
    • http://www.bash.cl/media/file/gifuwuro.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/88488313654.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/fejozoviniwu.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/tubuwug.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/bedelanaseboni.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/7369476522.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/joxovajevigupuwelel.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/85288843875.pdfIn PDF document text
    • https://iwistw.com/upload/files/67732373015.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/tekokoreninevolukev.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109070353586481.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/2436086559.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/doxubezojisadibubumix.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/zebuxatuvenosudofuw.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/29027130963.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4ca0f9667eab353fa7520556f7bd1aab/vapovojizopividago.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/bofarogepet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+take+my+tablet+off+safe+modePDF link annotation
    • 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_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 18008 bytes
SHA-256: 85ec7e74b49d1fd27498d1866c78564450793c869c23b5a6439d1f66d849b6ce
font_01_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 10644 bytes
SHA-256: ca69b89b096fb61f6f22822000a189afc8a2d5973603e5f1326ec59a6b598855

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