Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa630bd9e3674cd…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 18:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d7a79e72e4b43c6f712201afb178557 SHA-1: be46e09b3c91809714284bc8425d08fd093e0dcf SHA-256: caa630bd9e3674cd09d2b81de172792a2d3db3a315c6e1aa9340f7a88ff50cbd
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high-risk heuristic firing for a random URL link, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The presence of numerous links to disposable hosting and link farms further supports a malicious campaign aimed at distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://naturalfurnish.com/userfiles/file/figujamilugadowigonawa.pdf In PDF document text
    • http://carnow.jp/js/upload/files/45555738536.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5b064a71e121639ec508294c1b29d7c6/61700787373.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a968f159---fuwakuxen.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/jazur.pdfIn PDF document text
    • http://btfa.tw/upload/files/6569820788.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/72583452441.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/rojumatixejoke.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/84517032841.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/jowawavoladoxekanifu.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/79567380061.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/jedejumipisaxifawilepimog.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/98025075185.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/zixiw.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/99507013998.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/fakatazivikirugi.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/fulederinizojada.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/73268908040.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/9617184567.pdfIn PDF document text
    • http://esistore.be/userfiles/file/92317079469.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/51847989113.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/58888131775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=trucking+games+for+androidPDF 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_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 17972 bytes
SHA-256: 3d80c15217c559f9af3b339f8702f1061c34c2723d6f34e1583caa661847fac9
font_02_sfnt_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 10828 bytes
SHA-256: 864a6d590d83c2e2b56d65da01daee0fa0400d5ff50a47dc9ec8b0b9fa8160ff

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