Malicious PDF — malware analysis report

Static analysis result for SHA-256 b728cecae1c08acb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 05:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3753fbaa89720687feb0d6fe4118a7d9 SHA-1: 3878607199c3229b8c8e62bdd42dc29c20883e9c SHA-256: b728cecae1c08acb704f7103841b4a7e51822b730ea2267bcf9b20fe646644c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to various domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=things+letter+m PDF link annotation
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/tujuzevilimotazasikumubi.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/xikejuta.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/73558804455.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/92919893630.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/090323374090.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/25775139634.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/wozazifisala.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/49581845759.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/zubuneteni.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/doxetasadeko.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210904_C3FEC5336BF9399D.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109180551485353.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/91872694423.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/47232245179.pdfIn PDF document text
    • http://apart1day.ru/file/73380916479.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/taxitegizewuj.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/59953763615.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/65192118108.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/dewikewejaferudoreri.pdfIn PDF document text
    • http://identik.hu/editor_up/wekejaniwelopaku.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5a89b4c53a7be792779f215bfd79017a/49212468207.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/lodunetamogufavewunewu.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/vokawarezapasex.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/34992367406.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_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 10236 bytes
SHA-256: bad817560f983870aca103dac83b85701fcda0b78828e569e98ced9e519080b3
font_02_sfnt_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 18688 bytes
SHA-256: 411ae5d742f5268af9c40c7014ebf8c89e42444389244acd4238b6f6262d74d0

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