Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a30cc9fad853a1…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 13:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 623fe65a7cb8c145d26a63c8250b034a SHA-1: a783d7036641ded220dd35666e6537437f0ac9b0 SHA-256: 63a30cc9fad853a18a0a9070f87e3b932c317ae72c85171b325d19e47477f8bf
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 disposable domains and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://ventiliatoriai.lt/js/ckfinder/userfiles/files/dalofijasopurogonijenisa.pdf In PDF document text
    • https://indiansabroad.uk/userfiles/file/24113170846.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/bidaju.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/lowiwajozemelevuvak.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/vemijafivagapimatagi.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/gunanutawafazusonobekad.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/17223868154.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/842a323610d7e2c5b9b33704058b128f/xavuxob.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/vafijutikepud.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/13429857083.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/44915229206.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/99836244150.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4164780928.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/27975804919.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/81514023263.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/bokadukofalegaludufenab.pdfIn PDF document text
    • http://pb-book.com/user_file/file/xujudaxuretavoromaraz.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/11716102275.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/dowabokekitajilixugus.pdfIn PDF document text
    • http://eternaseguros.net/files/files/kotikupifu.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/98114752689.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/zisazoseduvabuw.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/81809822107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=facebook+lite+tpk+download+z2PDF 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_off0000c573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 17620 bytes
SHA-256: dbf341b62026abc43b5e2b99409ac00fd4097b3c2f08c27de37ae8f280206f1e
font_02_sfnt_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 10716 bytes
SHA-256: c9884ef550422d521aab32e78c6e6d467555336bae16b78924a20bdd90a781fc

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