Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e62559f00634e95…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 06:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bb01d1ee66b56dff4e92cc17e54d89b SHA-1: 95608b85309ef5255ed69aa8775d89805dd3232a SHA-256: 3e62559f00634e952dcb37efb9e309f9512f786527ab72728edeecea66661b39
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. This script likely redirects the user to external URLs, as evidenced by the numerous suspicious links found in the document, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier further support the malicious nature of this file, indicating it's a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=photoshop+file+convert+to+pdf
    • http://klccpa.com/userfiles/file/43847438290.pdf
    • https://hometeamcorp.com/images/usr/78577568450.pdf
    • https://sanipacific.com/attachment/file/96646700716.pdf
    • http://garagehayashi.com/js/upload/files/bibadujukeb.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/l84mdvptetj7vda3emogkivqcr/kafadufamaxip.pdf
    • http://skogsformedling.se/bilder_umeny/File/1445553001.pdf
    • http://lagunarent.lt/ckfinder/userfiles/files/didisixosunizulokezaf.pdf
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/95325787142.pdf
    • https://scalper.ir/data/files/file/37653019054.pdf
    • https://www.tristar-technology.com/ckfinder/userfiles/files/38329556742.pdf
    • https://zhansq.cn/upload/file/sugogeporadog.pdf
    • http://cybernet-ap.com/UserFiles/File/33550009686.pdf
    • http://plenaseguroseprevidencia.com/fotosempresa/files/tudawelaworipeseduwamif.pdf
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/nerutef.pdf
    • http://anbao.vn/uploads/userfiles/file/11237805160.pdf
    • http://jjmcp.jp/userfiles/Image/file/22759653156.pdf
    • https://metrosecuritynepal.com/assets/userfiles/files/vunovavuzaderoxugelefek.pdf
    • https://parkettworld.com/upload/files/9886706957.pdf
    • http://cuacuontoanthang.com/media/file/61460394131.pdf
    • http://geomanteia.com/userfiles/files/68731750460.pdf
    • https://broadcasthub.com/ci/userfiles/files/4969398562.pdf
    • http://acelybio.com/upload/files/naxivudemenibesoligaxe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 16792 bytes
font_01_sfnt_off0000fa34.bin
45b5b2e2cd712248ed349b8666fe6959639c14658704cc117efeea43ed5e2b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 10620 bytes
font_02_sfnt_off00011271.bin
28c223676aa37abc08893b85afba16dd070cf53a6a230eedb464e4b013cca3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 18212 bytes

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