Malicious PDF — malware analysis report

Static analysis result for SHA-256 4816f4ff3f97f54b…

MALICIOUS

PDF

69.6 KB Created: 2021-10-04 07:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b809f9b25fa75974fb69fe37a544d064 SHA-1: f1e903d6986b8e576da8ea0548942f6553ca0a04 SHA-256: 4816f4ff3f97f54ba7c55fa895e37bdf2f5da03d403f73bdfe54d9519f338417
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests the document is designed to redirect users to potentially harmful websites. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly support its classification as a phishing or malware distribution vector.

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://constructor.dilen.top/upload/files/rasukamebofosuregif.pdf In PDF document text
    • https://cnn-logistics.com/asset/files/94252112910.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/xugelukad.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/90660058386.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/96816656450.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/44950790805.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/48433312887.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/dukus.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7ed1e0e9008da17c7fd22ad6fa20e810/tomunijodonomepurawaf.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/75015896374.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/juvetopakemupegazup.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/ginukemokari.pdfIn PDF document text
    • http://yuli-china.ru/d/files/35736868783.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109041653288006.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/3274428701.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/84111836500.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/54690681890.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/nozel.pdfIn PDF document text
    • http://koddous.com/userfiles/file/39048718586.pdfIn PDF document text
    • https://socardan.com/userfiles/files/20165620960.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/sodaduv.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/17947803718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=probability+and+statistics+devore+solutionsPDF 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_off0000adb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CB 10784 bytes
SHA-256: 2ce77fa8117d4fc565a51e2db55285e9613fddb33dda6bc9c7951fdfbe8dad2d
font_02_sfnt_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 16356 bytes
SHA-256: 20ec2db772b2368a80b8d97968636a97db9cb8a422304e668c1f3b946ee1f3cd

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