Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0dba3eb1324c52…

MALICIOUS

PDF

75.3 KB Created: 2021-10-03 14:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 04bcce75a454d567dd80ac51f90e3942 SHA-1: 60f6dc19601135670a76b633b19f72e07ac087c3 SHA-256: 4e0dba3eb1324c52cb69bb01961134ea6d01a07e39817ea8fe62d0eb4f4036b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured to appear as document downloads, suggesting a phishing or malware distribution lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing campaign or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=o+god+whose+only+begotten+son PDF link annotation
    • http://sushigonewildtogo.com/uploads/files/99378999917.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/97852534270.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/wexub.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/savixeded.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/56955259291.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/tipodozifawopekup.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/71278293974.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/47338509703.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/421916607.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/pefepokivebexemufuzosoki.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/76917373880.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/9smjgo6npc9uo5behi8sbpjjv6/vaxuvalotiwikona.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/89316304457.pdfIn PDF document text
    • http://lovesenergy.nl/file/17805816457.pdfIn PDF document text
    • https://aneri12.cz/res/file/56876482376.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/45838979384.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/bixojajom.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/29409334674.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bemigotudivebowegebubiv.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/66963113673.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/52059722357.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/11f89ii43p5thme68erkgubnvs/lekan.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_off0000c013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC013 10536 bytes
SHA-256: 996da187fa76cd2e1e460a464eebed449b62288c42f624e16797c37075879ef7
font_01_sfnt_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 18372 bytes
SHA-256: 7d1f8fa0541750790e683b518e4a107485277054d19444cdcbb79c8ea776b894
font_02_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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