Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85fd78759cd1087…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 08:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4706327fe16490f727d65fb81aa4452 SHA-1: db3b6dc3ed440637e1b9a28cfc30ebb6f5aa9deb SHA-256: d85fd78759cd10870765304095c082809ca325504dc3a10caae889f81f0e0e4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic firings point to the document acting as a link farm, embedding numerous external URLs that likely lead to phishing sites or malware downloads. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://arndt-fahrschule.de/userfiles/file/20388822655.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161338a1419484---6725520330.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/63466727069.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/37641407830.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/95991908742.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/sozuluturisonamebiduzep.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/befitixixinuropidaj.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/budinakitileberup.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/tasosodoxitanugoxevenemip.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/3259377121.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/57876147357.pdfIn PDF document text
    • http://scarpatti.com/files/10932322861.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/sezekirivowun.pdfIn PDF document text
    • http://lyshiying.com/d/files/bawenurupevovofufakewe.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/82359919878.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/nobilatigejojavaxoditiwil.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/kudub.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/81718790025.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/rojebijizo.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/lodageradedasolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bachelor+night+movie+onlinePDF 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_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 17128 bytes
SHA-256: d51a7ab28c8f7738c93641339bada2791c663d39a57424d236eeb4604cbd3b55
font_01_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 10628 bytes
SHA-256: b23b972b0e3a7c89bd484779712605d4b65a1392f5f577c41f75ababc8eb7968
font_02_sfnt_off00011af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.