Malicious PDF — malware analysis report

Static analysis result for SHA-256 de444b5ccabf7c39…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 03:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80545378f97f0d92147cdd78cac0a0a3 SHA-1: 9492d9e1d94c7e235b988e7b3a6d90b4f4b114f9 SHA-256: de444b5ccabf7c39ec1f326883a6bd397d2c03e191a960f7390257bf49df150b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a lure for invoices or payments. Although no scripts were directly extracted, the presence of numerous unknown URLs suggests an attempt to redirect the user to a malicious site, likely to download a second-stage payload. The document's structure and embedded links align with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://energy-labels.com/userfiles/file/vuxamebopanomefugifin.pdf In PDF document text
    • https://olterus.info/contents/files/segudanasarumotakofeludi.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210903_185553.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/wulenetet.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/robuzuj.pdfIn PDF document text
    • http://safarang.com/basefile/files/fomat.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/329a76dd0372739a65496ea6bd87d62c/14290176509.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/zakelafoxazipe.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/kefotexija.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/95955485886.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/pimabe.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/60369031748.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/7358698154.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134db6a56aab---93928603198.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bitibezu.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///fategupolam.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/62535700713.pdfIn PDF document text
    • https://advik.net/userfiles/file/11549302025.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/wosowulasumuk.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/61340126288.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/64207873724.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/78330568374.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/miwezigolopoxulosi.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/vetesedobodejetomaxuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+change+countryPDF 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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 17480 bytes
SHA-256: 466fd25e47e7687fb0281d340b3708458a831045bfc91414d7b4a5339b8fb90b
font_02_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 10632 bytes
SHA-256: 720120533d2db80e38d114c020a51f0fe0bdda3ec9697d2167b845ec781450cf