Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c47882ed6c9c08…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 01:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f2f07d33a79e16820628e6d3bfe5e6f0 SHA-1: e19463ca2c3979c6da07fa336c516dc1e87fa812 SHA-256: 67c47882ed6c9c083ade24d5bfd4c083e97ffd66af21d5f8d8703139cb3029c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, but the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=oil+well+drilling+mod+apk+android+1 PDF link annotation
    • https://get-insurance.in/ckfinder/userfiles/files/81538034453.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/85971390797.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/davagodoxi.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630783568.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/zibamamoxasim.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/jinexuk.pdfIn PDF document text
    • https://csodamalom.hu/files/files/81215076822.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/10990130025.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/81856113544.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/wopawukabasidojik.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/88979282.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f13def307d---kinaxemige.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/90394350695.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/bogutizukukasezusalida.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/befonafe.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/sesixebalowugoguj.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/jagesigagamibis.pdfIn PDF document text
    • http://moretonassets.net/userfiles/80139658786.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/98706352202.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kewegezukadilinebirufo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8094b6d62---foxumevuxogaxizinilolo.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/doboduja.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/saduzijukome.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/komapibunimugux.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_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 18880 bytes
SHA-256: ae241ebdf18ac8a6da5f38e514cae7d41ec2780d880b76161f697a1f84726308
font_02_sfnt_off000122a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A0 10724 bytes
SHA-256: 7688bebfa8d5a144785fe73007cce1371fb27f11abdaa566e7ca2d5dc68c89b7

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