Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7ef24e8d221001…

MALICIOUS

PDF

89.0 KB Created: 2021-02-19 20:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 00e2db3004c0a5e55ebc771798255497 SHA-1: 775967dc5c2d2baecda9c056be36beafe6320e55 SHA-256: df7ef24e8d221001dcdf484282ed0ac7d27d87ca46fa7510123d36ba102cd38c
226 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded URLs and the heuristic firings suggest this document is part of a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://leonvi.ru/strik?utm_term=can+colombians+visit+america PDF link annotation
    • https://cdn.sqhk.co/kixituvelil/htgFOgd/her_story_web_series.pdfIn PDF document text
    • http://kibipasadas.iblogger.org/banjaran_ka_gana.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/6mgBSOw/33383830430.pdfIn PDF document text
    • https://cdn.sqhk.co/kopuzeginev/gjj5Oge/monitoring_internet_traffic_software.pdfIn PDF document text
    • http://womarerawona.iblogger.org/21919908158.pdfIn PDF document text
    • http://goodsfor.life/drop_fade_curly_hair_black_males4vku.pdfIn PDF document text
    • http://verifedform.com/dur_assamese_movie_songpv0r5.pdfIn macro / runtime command snippet
    • https://povoxiguda.weebly.com/uploads/1/3/4/0/134016665/filogugutikiwu-fabefewubogi.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/jetuzama/iigepia/31960533202.pdfIn PDF document text
    • http://tublitalia.space/different_text_structures_and_their_exampleswhh08.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/hgjeije/free_wallpapers_for_samsung_a20e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fokapikow/wutemetewifegaresa.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/luwidumozotuwibevoko.pdfIn PDF document text
    • http://rovarede.rf.gd/admin_dashboard_php.pdfIn PDF document text
    • http://xibogowidam.epizy.com/medico_legal_report_psychiatrist.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/android_studio_set_jdk.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/exclaimer_cloud_setup_guide.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://rovarede.rf.gd/admin_dIn macro / runtime command snippet
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 5048 bytes
SHA-256: 380e910a37be210ac3b68a577ddd7c57d6ebd6a37e3aa1187851e0d07f7fc218
font_01_sfnt_off000119c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C8 11624 bytes
SHA-256: 6093e7ccf816e417940cf401bd147e4a23da1f2b2ca91846465e1ccedd011dbb
font_02_sfnt_off00014108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14108 16192 bytes
SHA-256: c903727d1fc1f6ae1b889c39bd613d30596c696eaa42e1410baf014942e292ec

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