Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d198a27113465ca…

MALICIOUS

PDF

68.7 KB Created: 2021-02-23 00:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 117b0ecb32c3a2e8989d8b126ce72699 SHA-1: 67be622044341699e7688c2c722e866b69d343f1 SHA-256: 4d198a27113465caa5c57b8dcd919e0f53a182a6289601ba68eff147944fbdb7
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malware or lead to phishing sites. The document body, though heavily obfuscated, contains text related to software downloads, indicating a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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://druttle.ru/wb?keyword=engineering%20drawing%20software%20for%20pc%20download PDF link annotation
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/panajodi_dowejajamokeze.pdfIn PDF document text
    • https://kivisibef.weebly.com/uploads/1/3/0/7/130775328/0341507c7.pdfIn PDF document text
    • https://nijuvijoz.weebly.com/uploads/1/3/1/4/131408832/vukadopijezaxen.pdfIn PDF document text
    • https://buzotenugi.weebly.com/uploads/1/3/1/4/131408099/2623442.pdfIn PDF document text
    • http://raisinsapp.pro/9134938571berg2.pdfIn PDF document text
    • https://pifaxatopegamu.weebly.com/uploads/1/3/4/1/134108845/ff5161e1bc8d8d5.pdfIn PDF document text
    • http://geleostone.online/pdf_ausfllen_erstellenodt56.pdfIn PDF document text
    • http://richmaya.site/legetobufesetisovadaviwibcfzy0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gopudagob.epizy.com/4142728615.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/new_bollywood_full_movies_2018_khatrimaza.pdfIn PDF document text
    • http://xetobagog.rf.gd/lirr_train_schedule_huntington_to_penn_station.pdfIn PDF document text
    • http://nifimemewiz.epizy.com/scrum_process_template.pdfIn PDF document text
    • http://namavorudil.epizy.com/excel_business_expense_tracking_template.pdfIn PDF document text
    • http://fejolisevew.rf.gd/gallbladder_diet_list.pdfIn PDF document text
    • http://pijularof.epizy.com/78059507582.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_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 5372 bytes
SHA-256: 07cb9033b12d1ff7ed31acb1cdeeae6417114ec9293ea64341959662dd6a232e
font_01_sfnt_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 10028 bytes
SHA-256: 05109e7b4c5831a4d498e0f69cc699a0bceb0e70e638967de5480ffd902c77b6

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