Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b05f71dfb8c4ae8…

MALICIOUS

PDF

96.7 KB Created: 2021-09-12 11:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5db401acdc64b6f6162cf94fe1e0c9a SHA-1: b8ff3b6559188e3885d552b1a57625c4e7d20503 SHA-256: 9b05f71dfb8c4ae8636ad4fb40bfeb795caf799f15fc715d411c7f32430f61db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, such as the one found pointing to 'laborke.ru', which is characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=pokemon+white+2+hack+rom PDF link annotation
    • http://hoadon-dientu.net/images/files/3015223109.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/jemed.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/153603360861357d74042fe.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/99291400243.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/gamixamuzonekaroxazavuwut.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/72171881953.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d095360a---72165337184.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/57167531419.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/25040064457.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/71555706169.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/chdefl1ap07ofk26u4uln07l40/21329362824.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6130f1f6202d7.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/49314827769.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/finabisigesidin.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/fuleg.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/70567353236.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/xegusitogupovibesevuvowa.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/51370399796.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210904053442.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/38097099945.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/pagelikixesikoxafu.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/86446133938.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_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 18028 bytes
SHA-256: 9018c2843d5514862423b58f1b9d8417aa8f2f165957a634b89ed1007846dece
font_01_sfnt_off00014537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4E 10580 bytes
SHA-256: 1dcec95b4e14ba3dd95ced87dfcf8355913aabe26de3251dfd9b7466616e469f

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