Malicious PDF — malware analysis report

Static analysis result for SHA-256 e685ec25c7682fdd…

MALICIOUS

PDF

140.6 KB Created: 2021-03-31 17:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5cb439751e269f242f61109025957096 SHA-1: 5d2d42a6b22e682b8724c562eee242f16d3d2fae SHA-256: e685ec25c7682fdd32dd0e9226e34bfdcab6f9ca0e47d052dd4c5a87b877f736
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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.
  • 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://lozipotod.ru/123?utm_term=new+nco+evaluation+report+support+form+examples PDF link annotation
    • http://blockhcain.host/kudanusakuvupodisekimewitjorf.pdfIn PDF document text
    • http://chisto-chisto52.ru/3694078948ox3xw.pdfIn PDF document text
    • http://counterman.ru/peter_zumthor_atmosferas_portugues1v7kl.pdfIn PDF document text
    • http://cmb-societe.com/sepuromakexejijudow5emo.pdfIn PDF document text
    • http://organicsss.space/be_brave_little_penguin4x8rb.pdfIn PDF document text
    • http://avbox.org/calendario_escolar_primaria_2020_canariascerm2.pdfIn PDF document text
    • http://clubstore.pro/piregaruxivozofin4gkwe.pdfIn PDF document text
    • http://rollernefrit.xyz/netojivaweken31m18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_ffd22ed2317b4f8d9a3d006361d7f0a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedexim/71459175429.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/coast_guard_marching_song_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/herrick_lake_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/cheap_plc_controllers.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/windows_7_driver_backup_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/aerobic_and_anaerobic_bacteria.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_ab6a90aea2f5445f8025c74a2bd7337a.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_13aedefd63534c55b59d493c2befd404.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanaladu/mubodedodivubelaremuka.pdfIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_d1178e6da03949e9b90c574df7ea9f90.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_b35842590c0a44f38c2a53b901303ab7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/kenmore_coldspot_106_parts.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB41 5348 bytes
SHA-256: 53f1d3eb6f2c7865e2545daa1121ff4673f27dc9bdb17a89549ef98a8f100eb2
font_01_sfnt_off0001fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD80 11356 bytes
SHA-256: 405c3bf6d697d0874d8b1e5183759c09994caeb525c3011c749574dc650c6dc0

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