Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ed2720bbb235b6…

MALICIOUS

PDF

87.3 KB Created: 2021-10-05 02:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b1e1b9612906cce4d9f89c1755e2fc65 SHA-1: 1855e6315b2a7560eb5e1d079c84eae4722f0f85 SHA-256: 96ed2720bbb235b68badd3cf401edf28965e78ccb830ff6ed46fdf5aaef233de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://chcial.ru/uplcv?utm_term=beetroot+pictures+for+drawing PDF link annotation
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/21314303353.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/zusowanujogasidu.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/70789677984.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/31019921579.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/ginajopifokim.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/ravafubero.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/fipasenukepi.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/08af5aa58bf1b0c12196ef77f9df1035/sekakumoraxosofawiwesi.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/jejilotuduvonuxufovobe.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/48114639100.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/veseresidajifebefarob.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/gawujimipagibomomiw.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/sezosedovexezedute.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/89583461268.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/65270192194.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147941a2783d---kokekozaxixofoxab.pdfIn PDF document text
    • http://klpa.net/userData/board/file/wiwaworewomelowave.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/ponuxawamokarad.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/levevuminam.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/vuzowoxalowadumi.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1633011441.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/goleruxolavisapi.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/tenumidizejukap.pdfIn PDF document text
    • https://bawauang.com/contents/files/63871480585.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/23035436302.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012fe0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12FE0 18872 bytes
SHA-256: 87b8ec2277b9c743a8ff3586c224e68f5a07917da623b3c3ff96a8f4ef2840cc
font_00_sfnt_off0000d3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C2 10988 bytes
SHA-256: 0a18b05788eac27fab1fa67c3a98d9d090258f37cab441b20de0405dea958f3b
font_01_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 16832 bytes
SHA-256: 87f1817a67a3435b512e987bb1200239ab195ffc7949a5fdeec311d67975263a