Malicious PDF — malware analysis report

Static analysis result for SHA-256 403392b0700fc4a2…

MALICIOUS

PDF

88.7 KB Created: 2021-09-21 23:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adeac15123c5d3b02c39157460a88cd8 SHA-1: 025db5824670fc340410ae2108e650220809498f SHA-256: 403392b0700fc4a2383d3a7fc06345c5bc7eaded0502db6146a3cf55d7719cde
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to external sites, many of which are structured as link farms on disposable hosting. One notable URL is https://coretry.ru/uplcv?utm_term=golf+clash+hacks+that+actually+work+2021, suggesting a lure related to game hacks. The presence of external URIs and the link farm structure strongly suggest this document is designed to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=golf+clash+hacks+that+actually+work+2021 PDF link annotation
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/7684254801.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109101321421865.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/54039525476.pdfIn PDF document text
    • http://www.moyekolodin.com/files/marutetesesonut.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/18453588344.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/66214404618.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/55727594261419f43291ad.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/43163340024.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/sufaluleve.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/joroboxeselixom.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/16335665742.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/wobetewasupinab.pdfIn PDF document text
    • http://centrons.com/uploaded/file/1291033507613c7cf57420b.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-13/20210913192246498664.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/notafazoximefonigaf.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/toxijovatikitavomofozu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137da3c58022---padivatapi.pdfIn PDF document text
    • http://namngonviet.com/user-/files/51068091662.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/97119856052.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/nixirisaj.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/42961325262.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/tudigamitivaxafogegamupo.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_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 17460 bytes
SHA-256: f6eaf13228167e7b8f67e4a56db14b1f5cb8ab9fce64df76842841af8b949f10
font_01_sfnt_off00012393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 10828 bytes
SHA-256: 2a0acd469ff3565e604ae79a61558c918619fdfb332b1748c36ba5df1de38549

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