Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcfeb923f5d713c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 19:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6255319e76a0f372433895c0028a9d38 SHA-1: 54e31a90f719718fc86becc5e63479dc327a26c0 SHA-256: 6dcfeb923f5d713c8abd3d77aa33953ae95c25940313ef577c5924d8a33fa9fd
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs, many pointing to disposable domains or redirectors, suggests a phishing or malware distribution attempt. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=simcity+buildit+cheats+2020 PDF link annotation
    • https://himalmanpower.com/ckfinder/userfiles/files/15604459731.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/tarugumerokojanogurokada.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/73947863787.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/tezedaje.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109041641369692.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8323eb343bda3138d99dbdaa4a9fcd37/96275530924.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/wakifumiwox.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/98347175767.pdfIn PDF document text
    • https://sainaudit.mn/File/52609522960.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/3269475525.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/xemilojomidile.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/tebadozefidexifukof.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/gumanozibitan.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/39015831250.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/rilija.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/37240824056.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/pebanajizasol.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/namono.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/36914521383.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/geninakaperaredozes.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/kadurosikejazidifate.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/pajov.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/nopekemikopuxorina.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/dejararutijajeduwamol.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210912082813.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9f13e70986734d01f021cbe93796c55e/zibosule.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_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 10984 bytes
SHA-256: cb629ece226c998c704e611a5057ae5ab1dd1f32ea5cf0a9bb7749b37781df16
font_01_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 19496 bytes
SHA-256: cec1623f86ae6e2b0cddfd8139e32b0a36eee03e60d3508b0a4c4b5b3221ff70
font_02_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1