Malicious PDF — malware analysis report

Static analysis result for SHA-256 336a1d8c546bc4cd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 22:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3ad31504dfb7e429a02b0a8f51080a56 SHA-1: 078a7d1c36c310f515ce07af2df1f0d9d56cb1e1 SHA-256: 336a1d8c546bc4cd26462d5b492c78dcd9f6ef87fedaf0459c9fa7f298eeface
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, a common technique for executing malicious code. It also features a large number of external links, many pointing to disposable domains, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to download or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://behbehaniprojects.com/uploads/files/86542000952.pdf In PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/vivugilonom.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/tosokijokevisitegenim.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/sujofegotejapesijujumep.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/dekevew.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/03798ad0b30a08671942fbea3c0f3598/teguzago.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/59447921133.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/wujukupope.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/45182636464.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/22412409526.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/99507941408.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/vududik.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/11803142032.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/31057437530.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/liwevepukiza.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/dofabi.pdfIn PDF document text
    • https://etimes.mn/uploads/files/pubazazale.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/siguguzinoguvorefijuxak.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210919060433.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/2286078181.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/rapigeror.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/bowunasepipegujuzewex.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/38522161636.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/55980214844.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/jadomirasivof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=five+go+to+smuggler%27s+top+pdfPDF 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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 10752 bytes
SHA-256: cf21993cd1dfb6f9ee76cd6a637466c34c1c898d628c156b0f73de206ebc0c7e
font_02_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 17708 bytes
SHA-256: 6a81e0f762ee2ac95e8b02e33c4ddee76f5869ec63582a748b7e5f9abff53a90