Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c894281fd31f79…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 21:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 349a736938ce821e68c97a626f2236d6 SHA-1: 3c4a30cda9898421f23d8cae4d87b89a0f6f4821 SHA-256: c1c894281fd31f79664464016660413d2217ac0f2cc4f88e750bd000e026c9ba
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be metadata rather than user-readable content, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=war+commander+gold+hack+2020 PDF link annotation
    • http://aexpress.lv/index/images/up/file/8085393408.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/tepipowaxege.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/tugexajuxejenuvaxiwava.pdfIn PDF document text
    • https://kawanmto.org/contents/files/29120542455.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/3273200616.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/35742700724.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/powuwelokuwib.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/17489146963.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/libudepubesaxejexolut.pdfIn PDF document text
    • http://techbis.pl/files/file/fejinukukowutaxezubezu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/035ef8057da80b9c97b0c268e1e393ba/gozanulobaputajuza.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/geker.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286b02b050---97626673224.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/54100035937.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/vopamiz.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/32965383994.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/gizagozosotuwuki.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/94741184510.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/93436952147.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/neziro.pdfIn PDF document text
    • http://agilesolutions.in/uploads/zegesiratonutepunomeza.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/21103255118.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/badawew.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_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 17712 bytes
SHA-256: 15d0fc719b73080c8acc0ff32804d2d3da6fe36d0b16bbd03032443f844427f2
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 10784 bytes
SHA-256: 52f95f2b9326a138aef28b30dea7b5123df7b43885965d997f80a07a59a7fa5b

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