Malicious PDF — malware analysis report

Static analysis result for SHA-256 55499ff558438233…

MALICIOUS

PDF

95.0 KB Created: 2021-09-12 11:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: faedc7ef9843f95d91be0277350b44b7 SHA-1: 42cd115530232c54e73f2cfe791e6811e6c1c68f SHA-256: 55499ff55843823308bce9acc66e0ff37b9692e9510c77f6ccb24ab75d427af2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, indicating it functions as a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this, noting a high number of distinct hosts and links per host. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=adjectives+that+start+with+aw PDF link annotation
    • https://cfacgroup.com/uploads/FCK_files/file/66309761524.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/19640722975.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/gukajuku.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/gosulegigaja.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/gasimumotupuw.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/pigesasa.pdfIn PDF document text
    • http://packamate.com/userfiles/jokopuxikafonig.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/mikiworolireburisude.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f00be715---nezip.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/xikipizirodumijuzufegip.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/39615577093.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/54860165688.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/vekazexeximatulufusas.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/99090044316.pdfIn PDF document text
    • https://ienter.bg/files/82256299238.pdfIn PDF document text
    • https://citytrafik.nu/images/file/lolalitumigefixubovola.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/fegofo.pdfIn PDF document text
    • http://belean.pl/userfiles/file/71287352138.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/zugadezopev.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/gidepozajexeda.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136eb068c59a---todamosavivisirukena.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/kufunasovodewejabomitik.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/6312019418.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/23322190070.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_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 17648 bytes
SHA-256: fa6e228cde86dbc6ae9ff8277db07536f99dcbc40178cdb7c4d0018540eb1417
font_01_sfnt_off00013e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15622 10460 bytes
SHA-256: b997b454af2e18b7fd993dcdc6f9fdcf8645af405155e717273c8d083294829c

Open this report in the interactive analyzer, or submit your own file for analysis.