Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8797db98c746fdc…

MALICIOUS

PDF

72.4 KB Created: 2021-06-01 00:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6a47bbff646497c5df28dc261081fe4 SHA-1: 20e4e78d19c24d310f8894f06e24854d08769161 SHA-256: b8797db98c746fdce02042d4d5d81987dc2a13c165a6cb3b65898ffb3fa9b5c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to benign-looking documents, but one URL points to a suspicious domain. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and ClamAV detected it as Pdf.Phishing.Trojan. This suggests the document is designed to redirect users to malicious sites, potentially for phishing or to download further malware. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/pbw?utm_term=how+to+play+dinosaur+game+on+chromebook
    • https://fotavisemaro.weebly.com/uploads/1/3/1/4/131406710/f609da7de.pdf
    • https://nuzaguwimera.weebly.com/uploads/1/3/4/4/134492670/1176f7f0359a78.pdf
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/d15a934ec1df7.pdf
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/d633de73b.pdf
    • https://doxeraja.weebly.com/uploads/1/3/1/8/131871607/8985818.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2bc77bfb-e95f-482a-9c38-25881cf32b2a/hi_point_9mm_assembly.pdf
    • http://lugozamuxika.pbworks.com/w/file/fetch/144418680/busulor.pdf
    • https://uploads.strikinglycdn.com/files/5bfb7689-d065-4612-8235-a9909983fd3b/vapopipokiwaz.pdf
    • http://viluxese.pbworks.com/w/file/fetch/144428847/charlie_y_la_fabrica_de_chocolate_libro_alfaguara_juvenil.pdf
    • http://vowujepojez.pbworks.com/w/file/fetch/144428127/sedoranenobotufipodotat.pdf
    • https://uploads.strikinglycdn.com/files/2782958b-4852-4147-afc1-5d1f01ae885f/u8_clone_smartwatch_firmware_update.pdf
    • https://uploads.strikinglycdn.com/files/18c4fab3-c789-43ce-b3ae-b2e1ef498168/what_are_the_types_of_teaching_methods.pdf
    • http://kapetipubi.pbworks.com/w/file/fetch/144426117/14097614846.pdf
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144423333/22043208785.pdf
    • http://xuruzinijub.pbworks.com/f/marag.pdf
    • http://funinupun.pbworks.com/w/file/fetch/144425649/63145056543.pdf
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144428568/movimiento_rectilineo_uniforme_acelerado_ejemplos_de_mrua_en_la_vida_cotidiana.pdf
    • https://uploads.strikinglycdn.com/files/a1138b3d-cbc2-4ef3-b481-4cdfbfd6de54/rovekivonirajuvudo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbac.bin
64ce701f02382d38fa10386b5762482bd9a571c358295f3d7d4a78a5c62e39db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 5848 bytes
font_01_sfnt_off0000ef7d.bin
4a86063f334ff83203966128f810661ee68aebce5d90dec9f4d1315403df99e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 10860 bytes

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