Malicious PDF — malware analysis report

Static analysis result for SHA-256 13645513e1301cd5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 21:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c9dafb35ca51a0ac305b8970264e527 SHA-1: 622e6a3e2381202f131c2df5805a38dc223cb0bf SHA-256: 13645513e1301cd53a31c164ec478f5ef7ad77c1b67d4a4629f4bb10e6e1990b
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript and a high-risk heuristic indicating a link to an algorithmically-generated URL. This suggests the PDF is designed to exploit vulnerabilities or trick the user into downloading a malicious second-stage payload. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/73hd3od3vkqmmmtmg6hg6l124r/66894015673.pdf
    • http://maychebiengoduykhuong.com/media/ftp/file/dojifasa.pdf
    • https://theatresaucinema.fr/uploads/file/94669028208.pdf
    • http://pozitron-s.ru/userfiles/file/56930568337.pdf
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/gejopelobofonubeg.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/90181526265.pdf
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/68978628013.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/zopazetu.pdf
    • http://lechioutdoor.com/userfiles/file/13627533798.pdf
    • http://precisao.org/files/files/liwagizire.pdf
    • http://jun-travel.com/userfiles/file/85008349645.pdf
    • http://mictrogiang.com/userfiles/files/tadikefojupasevojarexud.pdf
    • https://bliznacite.com/files/zoxexodutenipiz.pdf
    • http://eperon-kochersberg.com/img_db/fijatizesobakofiki.pdf
    • https://kujainspectors.com/candyticket/uploads/page_images/files/91032844811.pdf
    • http://augustaelectricalwork.com/editorData/file/57683893444.pdf
    • http://freetds.net/userfiles/file/wakelilabiwiz.pdf
    • http://vino-charlie.cz/userfiles/file/vusekaganuvamenoges.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613b89664117b---pozoje.pdf
    • http://mascotdd.com/file_media/file_image/file/92341226168.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=telugu+mobile+movies+download
    • 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_off0000d739.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 16792 bytes
font_01_sfnt_off0000ef4b.bin
453e7244a98dd41f380c3b08329047c992225c9917de8ce4e4369f93ff97f3ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 17188 bytes
font_02_sfnt_off00011b86.bin
9a0dbf8d7a55a313f216f0dc94e972c48b9e96519308d6bcc46368145524d568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 10748 bytes

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