Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0ea12cfb6fd246…

MALICIOUS

PDF

88.9 KB Created: 2021-09-12 15:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b4c190129903f7b40252c3565f7114a SHA-1: 1ef26b357991dbe6ede61655f0cbc162686e21a4 SHA-256: 5f0ea12cfb6fd246bd919dfdd3f401901e88f0ff340dba95a0c049e73b0f3938
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one specifically mentioning 'how get flash player on android', suggesting a lure for potentially malicious content or phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, reinforcing the malicious intent. While no scripts were directly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=how+get+flash+player+on+android PDF link annotation
    • http://ccsl.asia/files/76849884759.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210910_B44068B18BC9BD98.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/48129882753.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e4eedb12---53315199860.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/83705373320.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/20302716576.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/50427660459.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/27316845971.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/43078419847.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/2418119498.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/sixegavilebezigudo.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/52917402661.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/22723324214.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zezevezeziriwosikenema.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/67067403332.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/69932782763.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/dexodizife.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/64553584872.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/39974273544.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/kuwelinawewukekoje.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///38071503366.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/revivakexezawumisowimot.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/koralureser.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_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 10968 bytes
SHA-256: a23cf91d356fd365d995862eaecb079bf572c4de24f5eba53ac98e00b7bb0a99
font_01_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 17096 bytes
SHA-256: a230ed2b38fc3be4135188cd877c0943999f19260fbc6224a66c72b1ff7e9533
font_02_sfnt_off00013e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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