Malicious PDF — malware analysis report

Static analysis result for SHA-256 5592ee11b93bbb44…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 03:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3593e83d8be6974c4964b4a0d1df92ce SHA-1: 12e277b59e5388501cf5610092ec3cf9a4a7b6f8 SHA-256: 5592ee11b93bbb44b389673702dc18a464c34215223deb4b0b01c556e0919621
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 file contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for downloading further payloads or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=frontline+commando+full+game+download PDF link annotation
    • https://kanat.com/upload/ckfinder/files/siwuma.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/53110818362.pdfIn PDF document text
    • http://cx-gl.hu/images/files/lafasozosal.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/51726976725.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/21c6541bef796ca85fe40e52d8aed97e/vowomemurizuvezofurosuk.pdfIn PDF document text
    • https://aildf.in/userfiles/file/46021886502.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/debizoloroxowosefajo.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/jetopevebalararikurip.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/97296588249.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161327f7763969---11486061988.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/lorudapabaxaso.pdfIn PDF document text
    • http://progetec.org/userfiles/files/pisolamirudogel.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/ralifi.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/rupuxajazizagakimufeku.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/zododugajaxetewe.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/kesojebuvizew.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/58153821313.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090613455273499.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/60477774023.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/tavila.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/70919123089.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/jupilox.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/70125372538.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/xuxowikisaturofa.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_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 10816 bytes
SHA-256: ef677b5cb0c76d96d3240374d311f0d90eff70523c5f1c259156a9a5d98c1e2f
font_01_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 17832 bytes
SHA-256: ec8e5b176a7e2ee3fea6e1640ecd7e5bef50206148383c591a8c051aac36a76d