Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7da981fba3b2a3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 22:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80f1389040c942fe4e231fd2f5194989 SHA-1: 55f4c474624cee8111bae2c3c45ecfd7bc56c3b3 SHA-256: cd7da981fba3b2a3fc208e61caacdb29d152a39daddac6628961c43fe67cfc62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smidgel.ru/uplcv?utm_term=barthes+image+music+text+pdf PDF link annotation
    • https://habibitours.net/ckfinder/userfiles/files/94236088513.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/topajapidigipa.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/25750858402.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd0888398c---mevavazog.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/20045571902.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/67275133973.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/jesomofeboz.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/46438722279.pdfIn PDF document text
    • http://etspak.com/survey/userfiles/files/85030988049.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/65754979008.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/wirapogabezadalolifo.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/1760859322.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/xilegupafebijojiremomuj.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/48920906461.pdfIn PDF document text
    • http://ropesadventure.com/d/files/67961327990.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/84c65eb981f5e71beeafc00389522864/rugarofifedax.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/rowefuki.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/6183788805.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/vevisesurinas.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109122219499532.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_off0000ac8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8B 11052 bytes
SHA-256: e3bfffdd86047579320a00ac07edfd203163414d9a09cfeb34da868beb5c1f83
font_01_sfnt_off0000c629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 16756 bytes
SHA-256: a89acd726b226d58e6f16c559b88387b8f482165b303436ef8288fc019da0161

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