Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8f7d5e74933ce0…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 16:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e9fd7418a9383be3b2ffd35d24833157 SHA-1: 8aba0b2946a0075a85400d9e93ebd248f7608f93 SHA-256: ac8f7d5e74933ce0c0262811eed04f214677b52020840c156285c1ae710306a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The PDF structure and the presence of external URIs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=2k20+android+apk PDF link annotation
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9383140b5aeb72ded56a601852ad3f50/jaribixepadilin.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/19858279678.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210907_040431.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/89955059485.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/87080225288.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/wogatuduves.pdfIn PDF document text
    • http://blgjad.com/upload/files/16184888424.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/fowasojemasawujugodozuzox.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/molixonibelobolamulopefun.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/zisexiliti.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/30944467077.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/4407775503.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/85364125135.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/narafelisitamupezesowag.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/69821723804.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/jokemunobawobabix.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210912190157.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/28042429996.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/1672014269.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210913111512.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/32480978588.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/veribuzawowama.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_off0000bd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7A 10180 bytes
SHA-256: b9b307d3a09895aed47c07af1845ee905fc120ff1cd58b7c3ee717a293049669
font_01_sfnt_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 17084 bytes
SHA-256: 44fa38f94b28b59a0a5181393fcee33ef1eb5f0ae622da3f869e68a98000d62f

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