Malicious PDF — malware analysis report

Static analysis result for SHA-256 5664e281f20da71f…

MALICIOUS

PDF

113.5 KB Created: 2021-10-06 13:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 602b087898a29a81540da6d4bcd8ac74 SHA-1: 5a88a1ff2fede0c7fdde3026e578cb4ac5f4b698 SHA-256: 5664e281f20da71fcfe76b8adc6e9d395e2e53f2e6b5821dbe6e12d92d835768
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URIs, many pointing to potentially disposable hosting, indicates a link farm or redirection mechanism. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cructi.ru/uplcv?utm_term=pyramid+of+number+in+parasitic+food+chain PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434f706ff68---5597059331.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/gelozul.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/navatagapeji.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/57651894437.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/pifuxoteleposogabedala.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/53783373586.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/kepetolotodebexutoduw.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/domolarevogukaxu.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/lufatojenitosojulawetuvu.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/97963197042.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/fomabinakoleg.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/newipixidibofunog.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/xurep.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/79291874635.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/88203654598.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/72041495694.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f752ac837e---wezinixaneviba.pdfIn PDF document text
    • https://strechybenesov.cz/content/9089866937.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/60066433561.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/bomazumukiwajivezukemekav.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/67053820404.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/mexoromi.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_off00014d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2C 11196 bytes
SHA-256: a1e8999cd4ed8e5f1cfac221ed05a4a23a81a7605c96a39e29317090e1f14b86
font_01_sfnt_off000166ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F11 22504 bytes
SHA-256: 871b70e1a6f2b0228d4ca6c142f752a46927263f1eaa138073c089f8ad13b16d

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