Malicious PDF — malware analysis report

Static analysis result for SHA-256 849ca68802161d3f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 14:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e78635190708fcb9929d62222e2202f1 SHA-1: 5187fe8b5ed91dd05ab1e465e8534d2c7a7bb988 SHA-256: 849ca68802161d3f3e9c24de5380f3713e3cae887958d08057b468e10211ae0b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sapporomn.com/userfiles/files/66096231962.pdf In PDF document text
    • https://ip-pharma.net/data/files/42721549886.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/55286709917.pdfIn PDF document text
    • http://dges.in/userfiles/file/nofonefilakiwulaku.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/wabux.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/nomusutised.pdfIn PDF document text
    • https://matrixx.lu/images/lokevigatitu.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/70081618556.pdfIn PDF document text
    • http://erdbau-rauch.at/nedotagozumoxuboxa.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/66047428921.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad352e96ef---xufokuponiwi.pdfIn PDF document text
    • https://simorgh.it/uploads/file/97215691220.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/rotapopetuvapusijufukuv.pdfIn PDF document text
    • http://prograsifkalip.com/files/23914545245.pdfIn PDF document text
    • http://esistore.be/userfiles/file/5256739255.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/detowijokasel.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/34313373728.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/10748778265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=oh+my+god+you+guys+legally+blonde+lyricsPDF 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_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 17720 bytes
SHA-256: 0f4444ac0b1eb4cf2c928e8a8617468219cfebc31efc975c04e46720a6cbedd5
font_01_sfnt_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 11096 bytes
SHA-256: 35ae40aff4cf2968f632827a4c85ae888d3c5f38aaa1e05d8a55dd19dbd9343a

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