Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58db39a625ec8b3…

MALICIOUS

PDF

93.3 KB Created: 2021-09-19 08:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d81e49586f46fdd388a31e0ea9e5b21f SHA-1: 44d68726c9d6fd4c40953e9834de31d994896c4d SHA-256: b58db39a625ec8b38e0b077ced040e00eddce391a13f6a550e8f87cbedece76b
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains numerous external links, some of which are hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and external links indicate potential for exploitation and payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=apps+like+deezloader PDF link annotation
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/xejutubelokonuxojagasuta.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/resanexekivo.pdfIn PDF document text
    • http://trevorhannant.com/29516210028.pdfIn PDF document text
    • http://cascad-trans.ru/files/sefijavemisifi.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/regepokesasap.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/migaboxopovivaja.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/42402529242.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/60223245941.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/kiwovilejazujazimonuweji.pdfIn PDF document text
    • https://tigaintan.com/contents/files/faboz.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/30220949016.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/vopukadupufuvisegamirevug.pdfIn PDF document text
    • http://chayka-svg.ru/files/dofilixawagumafipated.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/14603518850.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/64873524089.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e752923c3---luxapuneruw.pdfIn PDF document text
    • http://klpa.net/userData/board/file/42262010698.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210901075344.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0169f5c33b140f1d583bcfa6c1f516fd/rinamojolutilavabelevi.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/mibamasovof.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/wulebu.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/nikinavafoduveje.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_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 19404 bytes
SHA-256: aa724d89081f8a692d0f4601d84843bcd6365e3bb52170d0345add5c9446fa2e
font_01_sfnt_off0001380d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15024 10316 bytes
SHA-256: f5c799569dbfe8da839582564921006dba2c3cf1de5910a0664c02cab5b26874

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