Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8b5c5962a4ca03…

MALICIOUS

PDF

74.7 KB Created: 2021-03-09 14:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9649c3763a42a6f903fc7ce393da2e38 SHA-1: 28e34a860d1bec00cba0bd730b5a43b24a397f66 SHA-256: cd8b5c5962a4ca03ddbd65b4100bef018f10c6afd1bd06fcd625cc936b63d79b
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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 0.9997

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
  • 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://druttle.ru/wix?keyword=curl+request+python+example PDF link annotation
    • http://kiwepuwefa.22web.org/arboles_de_decision_resueltos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5ffa69607b50d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374519/normal_5fee81ee9ec41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376357/normal_5ffb3e094a56a.pdfIn PDF document text
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/gemamopetusabu.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/a718955c79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408596/normal_5feccd8836c2e.pdfIn PDF document text
    • http://vogujefaxuwel.22web.org/aambala_video_songs_starmusiq.pdfIn PDF document text
    • https://waxizeno.weebly.com/uploads/1/3/0/8/130814339/2884953.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fofiwufawiparug.epizy.com/how_to_start_career_in_financial_analyst.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87eb58a-4ad2-4fea-8880-24687181bed5/perfil_de_egreso_conalep_alimentos_y_bebidas_2019.pdfIn PDF document text
    • http://kibuwigukakew.epizy.com/97952059023.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/5867464370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4465f931-597b-46f0-a909-9ec934425d96/96650560797.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/buddha_badrinath_cartoon.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/can_i_connect_wireless_subwoofer_to_receiver.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/what_is_the_first_step_in_the_decision-making_process_personal_finance.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/anaganaga_o_dheerudu_telugu_movie_movierulz.pdfIn PDF document text
    • http://degudodenotiva.rf.gd/farixafezanisa.pdfIn PDF document text
    • http://wuxigukupem.epizy.com/dbx_166xs_manual_espaol.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_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 5260 bytes
SHA-256: 6bfae325729d12b84c5dfcbe0a8c707bccc9760ab219ecd2a68b84eaf5edc4bf
font_01_sfnt_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 11328 bytes
SHA-256: d1c6d2acdc046a363618b9f0df0c9397dbc1cf1288de9884b3b55b6c3afca6e6

Open this report in the interactive analyzer, or submit your own file for analysis.