Malicious PDF — malware analysis report

Static analysis result for SHA-256 9979861753bc4f35…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 07:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c02bebb1bb9bf4e42c29e31d5200c4f SHA-1: aad6768ce41436f95c64a1769964047627c55144 SHA-256: 9979861753bc4f35d5cc70f1b5c3991ba921944a118104db0ea37e8a3d325d4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to a link farm, indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The presence of embedded URLs and the link farm structure suggest an attempt to direct users to potentially malicious websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://traveletrust.com/basefile/traveletrustcom/files/vedovuzasaretavem.pdf In PDF document text
    • http://kristiankutschera.de/userfiles/file/jezitadivosuzogenux.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/soxuxaxeze.pdfIn PDF document text
    • http://clerus.hu/files/file/40120236900.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/85439562061.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/65668717686.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/94140821592.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/vubunupubagiz.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/tiregofiranudet.pdfIn PDF document text
    • http://sooclose.eu/upload/File/70937784809.pdfIn PDF document text
    • https://projetovm.com/uploads/files/bodopusivud.pdfIn PDF document text
    • http://theponghop.com/upload/files/23363351828.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/96534145784.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/91810404922.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/65384719813.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/10613273936.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/84254036458.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/54504725082.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/62675298106.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/83045078426.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/fimerabodogakeli.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161336ecb3c11a---19943665186.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/tobiw.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161406d33793cc---melafefaxefapanatave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=smule+apk+latest+versionPDF 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_off0000bd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5C 10744 bytes
SHA-256: 6616f1e2274886ef8e6cdf8dbda6627bb60551807598175a29b5b111a0f9e335
font_01_sfnt_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 17508 bytes
SHA-256: d7761932a072b95053e5e1d27f838d2144d2a428be929642fee0dff1316b6957
font_02_sfnt_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1