Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfb2d86808e9420…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 21:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f8084684ac887c9ea91fe09158aeb14b SHA-1: 3ca0afb1fc33b83f65f960fc508d3376e847f4d6 SHA-256: 3dfb2d86808e942049f6db80e1f8f479ca781ff43b32577f2fdcf5b2ccf06ab1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of a link farm suggests an attempt to manipulate search engine results or redirect users to malicious sites.

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://dpengineers.info/admin/userfiles/file/kavebene.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a229488050---gejut.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/57016945958.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/19161545645.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/xiwatovex.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/jovugavejepewerozot.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/78256924199.pdfIn PDF document text
    • http://web5gstore.com/Files/files/37245978265.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/63915183590.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jupuvudega.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/relijaj.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/wuguxobev.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/tidozofudinuzasufuzinu.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/30248856744.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/vumofigabadosedalagimu.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/51298908660.pdfIn PDF document text
    • http://canoeing.by/pics/files/gimetajerudosu.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/zujulufututefefoz.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/lusota.pdfIn PDF document text
    • http://favourtec.com/attachment/file/32074366103.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/67713189204.pdfIn PDF document text
    • https://noddy.nu/images/file/xopomesesili.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/butetuzizeris.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+to+ios+phone+transferPDF 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_off0000e679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 17908 bytes
SHA-256: ce871608071dae89443493c7e78d45e5c8f98347792d0edf692002f82115c920
font_02_sfnt_off00012d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D54 10528 bytes
SHA-256: 2ad9f47ff713203a041dfa87457b074c9aed804e32d604745f0b2e4004d80349