Malicious PDF — malware analysis report

Static analysis result for SHA-256 420cdeab32ba37f8…

MALICIOUS

PDF

75.0 KB Created: 2021-04-02 23:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3096f071a1f31e3a27016a8d05db3909 SHA-1: 5771aae371082b1c9c37c090bb879cad5591f350 SHA-256: 420cdeab32ba37f85efe55b6e6b4dc8d756778e3116dbb6333dda78c004371f8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF structure itself point towards an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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/wix?keyword=me+without+you+book+pdf PDF link annotation
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/8494060.pdfIn PDF document text
    • https://wadoruzog.weebly.com/uploads/1/3/1/3/131379034/a9c43b142.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/gfhagjk/zorevaxejoxabekevova.pdfIn PDF document text
    • https://cdn.sqhk.co/sejukuxa/lidAiMY/informix_4gl_string_functions.pdfIn PDF document text
    • https://cdn.sqhk.co/lukapokobejo/Yjdhhic/doxurotitufenuzan.pdfIn PDF document text
    • http://pusikoxelumide.iblogger.org/an_astrologer_s_day_by_r._k._narayan.pdfIn PDF document text
    • https://cdn.sqhk.co/gepaxulunan/jfARjaw/xuvajutetetalurutogevipin.pdfIn PDF document text
    • https://momukilogavar.weebly.com/uploads/1/3/1/4/131437465/bomowaloluwofelisara.pdfIn PDF document text
    • https://cdn.sqhk.co/ribuwikoli/hgc8Ugc/3771644631.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/dhgOQhf/34923573977.pdfIn PDF document text
    • https://nekamefirojes.weebly.com/uploads/1/3/0/7/130739169/kojivi.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/5df7ced.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toxukanubevaga.rf.gd/vezebefazawinuxilir.pdfIn PDF document text
    • https://e4dd5bf8-bd13-43e3-b37b-9624b2564f03.filesusr.com/ugd/093416_ecf5f494a9f94e3c88dd739a86a27288.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/83914963823.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_1f487769914041f585a974ee31fd1d93.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/tivomolonudurudenid.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_1fd2365b1f1b49aeb0a87c1f5f251f51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falejogajir/39947972069.pdfIn PDF document text
    • http://wixulolefafela.rf.gd/battery_voltage_monitor_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/pazazokesatikori.pdfIn PDF document text
    • http://pixagese.rf.gd/ice_breaker_games_for_zoom_work.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/papibikizero.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_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 5016 bytes
SHA-256: fe4b369add92c5aef8c1f75feff9a4735c09c69cb529cc4c1aa165a3b7262b77
font_01_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 11728 bytes
SHA-256: 18837ff522b3c017b623fdf976555bc39848e6eee5fe24bbcf542a0434a869d4