Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a041b66e9181a4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 18:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57aa7ea85408b8db979d40dd75f37e1a SHA-1: e672b85ce8b7be4727151cd2065dcbde50d43daf SHA-256: a6a041b66e9181a45e128f55969bc8b9e273bbd7196952460afc7621efb3a028
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links pointing to a link farm, a common technique for SEO manipulation or distributing further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF's primary purpose is to redirect users to a network of potentially malicious sites.

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 http://swaving-stalinrichting.nl/ckfinder/userfiles/files/63958025440.pdf In PDF document text
    • https://icbacademy.com/upload/files/34600305328.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/54470815334.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/suwuzuxurabapavub.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e72fda635af81e5d9e1a99ae9493a5c6/55242687709.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/5613708154.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/54288895142.pdfIn PDF document text
    • http://yibetter.com/data/files/tepebobebufon.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/38767771768.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/885ee3f295cf5159352ba65e52330986/43895608579.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210917_AD46E07C87410BD1.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/82041887672.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/bowixelid.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/kesuwodanogogoxaraz.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/jegowutepudele.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/dodujapa.pdfIn PDF document text
    • http://evola.it/userfiles/files/vetopawofasok.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/37127762142.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/rifazoxi.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210901102025322053.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/mifenasirudibog.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/zoxopeturajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=poco+m3+vs+redmi+note+9+versusPDF 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_off0000d46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 10828 bytes
SHA-256: 1f873bc8636b18aaee3412f79ea6427b232d45f5f677c5686a87c2ef3652e195
font_02_sfnt_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 18788 bytes
SHA-256: bd4108efafa5a32acb8a37c1d63532fe3ea286b8a59b18e079e796a68272f936

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