Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a68ecb4e551871…

MALICIOUS

PDF

101.2 KB Created: 2021-03-24 14:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a459b40f2e4baf18ca460a8303e660b4 SHA-1: d7b106e5762189ead9e5dc91a30105868ee93568 SHA-256: 47a68ecb4e5518715d6749e229118ffa9632ea7b55df2ac24e3fddad4ec20801
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=hemorragia+por+atonia+uterina+pdf
    • https://cdn.sqhk.co/jikowuzu/cOhdfrZ/au_mix_mod_apk_revdl.pdf
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/lusowezoku.pdf
    • https://cdn.sqhk.co/vojofarakiva/Ugghgha/bedaginolusirivev.pdf
    • https://vomogavuxif.weebly.com/uploads/1/3/4/7/134762738/bovukulodiwerisatex.pdf
    • https://cdn.sqhk.co/farafakilof/hoKighg/boss_me-_80_manual_svenska.pdf
    • https://cdn.sqhk.co/gitogozune/ih7md1s/tilax.pdf
    • https://rigegafotu.weebly.com/uploads/1/3/0/7/130740045/rifip.pdf
    • http://instahelpforbusiness.com/jukolagoridoludezitw9ik.pdf
    • http://pink-echo.club/my_movies_for_mace155p.pdf
    • http://gepupovomuvota.iblogger.org/xirizowusewedaxumagisawed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/padosumifubobo/katatuj.pdf
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_7e97b9f5fe2e45af87014f9610b7798f.pdf?index=true
    • http://xosareregaka.epizy.com/react_website_templates_free_github.pdf
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_63590720c31a4151996cda499dfc8af7.pdf?index=true
    • https://s3.amazonaws.com/faxaxos/how_to_connect_dbx_driverack_pa2_to_computer.pdf
    • https://s3.amazonaws.com/bifamomove/acc_aha_guidelines_heart_failure_2013.pdf
    • https://s3.amazonaws.com/zozuxukoxo/lerojuwokiwiwekepari.pdf
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_71b8685e4f6947179015156c0ca995da.pdf?index=true
    • 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://scripts.sil.org/OFL
    • 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_off00013526.bin
182b3113d92d083776ce63a189ec11cbe4131ed70c9a642b08f9d8a3cb4ec894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13526 5112 bytes
font_01_sfnt_off00014672.bin
d5f32256ce853df1d458c20d2723467287313f3905736292f1f41360fb542f0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14672 12724 bytes
font_02_sfnt_off00017005.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17005 16204 bytes

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