Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f2c423cf80a8c5…

MALICIOUS

PDF

86.7 KB Created: 2021-03-12 17:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 9c47bfb14ade82da83f5ff6e886de4bb SHA-1: c0c37ca952ca290f6ee5557946e6b467cb905d76 SHA-256: b5f2c423cf80a8c54a27047b36e74cbf062c054e715727aa25edaa1c6d23a360
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially keywords for search engine optimization, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://kuzutuzo.ru/wix?keyword=maytag+washing+machine+repair+manual PDF link annotation
    • http://zakewabo.scienceontheweb.net/agricultural_meteorology.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/how_much_is_adobe_premiere_pro_cc_2019.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/kuvokobiwireb.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/can_old_diesel_cause_white_smoke.pdfIn PDF document text
    • http://noxodexuvalolum.iblogger.org/14616201561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_6019cf1c33fad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483587/normal_5fe053f4ba1eb.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/what_is_the_most_profitable_business_to_start_in_2020.pdfIn PDF document text
    • http://vawojiw.22web.org/88373446898.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487903/normal_5fc85ee1d627e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423757/normal_5fcf933094b54.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/570cc2ff-cbde-4763-a999-d2d80a4d6ba2/how_high_are_hurdles_for_12_year_olds.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_63c375eabdb44ba1b5de2b52179f57a9.pdf?index=trueIn PDF document text
    • http://muwojes.epizy.com/burton_jacket_size_guide.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/vozabum.pdfIn PDF document text
    • http://jigikox.rf.gd/camera_fv-_5_apk_full_version_free.pdfIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_7a4a628ba5ca4f4289a9b108a0e756d8.pdf?index=trueIn PDF document text
    • https://81da701b-0f85-48f9-9040-0f88ba79a05f.filesusr.com/ugd/bf07b1_3e62acbaa60a4a48b113600f455c518e.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_a447506e73a44ee9942aacd110c29216.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a6787e5-1760-4dc6-9e81-f9f9ade44d8c/94813408902.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 1724 bytes
SHA-256: 90fb1042126c15d8a796f6f88dc26108755fb6ca519e05b6d0de05ca6d3d969f
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 5544 bytes
SHA-256: 35622992e482b40e174e6e37d4fc60d4b438c106de8ee686e7f77c98228d62f2
font_02_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 10936 bytes
SHA-256: b72eca42c733c16ecbb91252b1374815bd740ff0bc32c3f94897bb48acd415c3
font_03_sfnt_off000136a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A0 16084 bytes
SHA-256: e5245523bd71a78e06ca3300da63f55ad096e28dd8c1a5e83e138be64f7d0aee