Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff8983898cbcf25…

MALICIOUS

PDF

94.0 KB Created: 2021-09-12 23:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67e751aaead80afd3dbddd115063f5e2 SHA-1: c00493169dc6cc3bb380cbf5bee072bec8cdbac7 SHA-256: 0ff8983898cbcf2538615b0b6dce6f40131c96f06dc81e98f9e482c607eb6884
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://cana.vn/uploads/userfiles/file/jutata.pdf In PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/zezijagowimudibakowabib.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/wufop.pdfIn PDF document text
    • http://chieucoingason.vn/files/69457926547.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090803095073499.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/2030553105.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/73040852004.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/22112947377.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/53091738167.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/66431571134.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/pumugikirejumoguvezo.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/52173945830.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/43659094999.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/verubivozenudukasi.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/51483609047.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/49565811761.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/59960639080.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/visebelagebudoridajibo.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/53968029097.pdfIn PDF document text
    • http://staropolski.net/Upload/file/wepanofoporakawepegijet.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/22357787768.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/46981045364.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161356b4787f42---40598691206.pdfIn PDF document text
    • http://csp.hu/editor_up/31451686455.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/4278791839.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/xudamepawotuvikifojudunok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+export+pdf+in+photoshopPDF 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_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 10568 bytes
SHA-256: 289063ca86526bd9f21a26700d377953c5f219b5d3d333706032c4c0b9eedd00
font_01_sfnt_off000121a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A0 18504 bytes
SHA-256: 559a1e35465891a3ed652edc8bdc61819a61b7dbae11a2e8cf52bc3bee172f7a
font_02_sfnt_off00015254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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