Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e5eecc0df4419d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 06:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: abdc44b31e810181de910bf13e6a3a71 SHA-1: 8e78bd92f26b0677f6f0b59610036406a2a1fb11 SHA-256: 03e5eecc0df4419daddce3fe1880586d523ab131857861d60d46c6a2ea88ea3e
146 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. It contains numerous embedded URLs, many pointing to disposable domains and IP addresses, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://webkapper.nl/ckfinder/userfiles/files/muluronenabe.pdf In PDF document text
    • http://jl-vacuum.com/upload/files/jakiwarubek.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/mikagetiranejukemuv.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb89c5928---36819181460.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/39019572286.pdfIn PDF document text
    • http://hingliltd.com/userfiles/mobegeposizadezodi.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/36687304709.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/25653006062.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/xujurekusajitezixu.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/94104574786.pdfIn PDF document text
    • https://schmitz.cz/res/file/60055849463.pdfIn PDF document text
    • http://domuran.pl/files/file/xofonugovawawig.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/28838714702.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/44298518945.pdfIn PDF document text
    • http://showdoimovel.com/files/files/72868086387.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16134f80e84f0c---76514150470.pdfPDF link annotation
    • https://nguyenhungstone.com/uploads/image/files/nadosuwekakaja.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/wenalerebitorulogi.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/jewoxajexuv.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/domadogidapipadaxomawixu.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/fodugefa.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/wisuramurawewezawexuj.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145704a2a7c2---lisis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+usb+tethering+in+androidPDF 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_off0000c56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56B 10716 bytes
SHA-256: b7565dfc50372ee8d0d0e1c62dcb8697be53a3f2aadde02af9bbfd9c80ad3fdf
font_01_sfnt_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 17440 bytes
SHA-256: 8aa7dc981fa4a01aa16a28b60af33d055d2a84c0eada2e1044093f55a8e42796