Malicious PDF — malware analysis report

Static analysis result for SHA-256 0863cdf294d4c447…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 08:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9d4fade251f004565c95a3d0d01462d9 SHA-1: ceb625cf4b75c016c97a04182c3275cf9fdb5025 SHA-256: 0863cdf294d4c447bf3c050b4f1c6aecf37bfa0255938b884e9590d84b683e73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various PDF files hosted on potentially disposable domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/relesomojadamo.pdf In PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/ralazulijunubugu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/99941814007.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/3337254775.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/gonutukusolakule.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/mikominokem.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/fudoxivaxazigitixilasa.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/97868888287.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/42019043313.pdfIn PDF document text
    • http://myslizdrave.com/soubory/67111933378.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/juluronubi.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/lufusi.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/98115007433.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/vonun.pdfIn PDF document text
    • http://abpaluso.com/upload/file/3680810153.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/41448378383.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/53288054068.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/zawafasuwuwelefanobanej.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/jiwezokidal.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/panizurumexupupapezoparad.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/79230895714.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/91622788738.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/97590243855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=iphone+not+connecting+to+cellular+dataPDF 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_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 17264 bytes
SHA-256: f79098ee756f26e6a861f7a81e5692e90de8b153f04e2ce5df84326ae56222f2
font_01_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 10676 bytes
SHA-256: 1595491eaa3baeb9c6cb21cda41a796ba7420326120aaf474663306c82dacf0a
font_02_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1