Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a686c16ec27d3c2…

MALICIOUS

PDF

81.3 KB Created: 2021-03-20 15:28:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8cd919960cf8af41317c975344dccc15 SHA-1: 21636db8a069e185713c13efdf1215de216fc37b SHA-256: 4a686c16ec27d3c27f7c3f32d0492069ddb1e8074af087b22005357f9a4e7943
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF structure and embedded URLs suggest it's intended to trick users into visiting malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=city+college+academy+of+the+arts+ranking PDF link annotation
    • http://bigakeka.iblogger.org/vodafebepivug.pdfIn PDF document text
    • https://tapajiwegunet.weebly.com/uploads/1/3/1/3/131380495/600bb3840a.pdfIn PDF document text
    • https://maxawoxemun.weebly.com/uploads/1/3/4/6/134615094/nawareresifo.pdfIn PDF document text
    • http://rating-bookmaker.ru/husqvarna_42_inch_riding_lawn_mower_reviewso3sk9.pdfIn PDF document text
    • https://xijegasafofid.weebly.com/uploads/1/3/0/8/130815381/7a00dd816ad.pdfIn PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/42cbcb.pdfIn PDF document text
    • http://megatorg.ru/drill_and_ceremony_powerpoint_classmpn7a.pdfIn PDF document text
    • http://fashion-deals.xyz/nizuxuniwesosazofiziboluounas.pdfIn PDF document text
    • http://quickstore.pro/guvadatibabiwitujelek3r604.pdfIn PDF document text
    • http://pigokakiw.iblogger.org/nightmare_before_christmas_live_wallpaper.pdfIn PDF document text
    • https://zenanewexakidop.weebly.com/uploads/1/3/5/3/135310893/gegos.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/toastmasters_manual_download72543.pdfIn PDF document text
    • http://xtina.online/54282182999btqhd.pdfIn PDF document text
    • http://copyrightshelpcenter.com/32682021424jv98w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabowiruxurupob.rf.gd/bromelain_enzyme_activity.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/tazigiduwozo.pdfIn PDF document text
    • http://zesinule.rf.gd/adjustment_entries_in_final_accounts.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/xizemu.pdfIn PDF document text
    • http://gikiwajufekozi.rf.gd/totiluboxogefojinikepe.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/jefujenoxun.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/gimajimavuk.pdfIn PDF document text
    • http://dadogabipot.rf.gd/vomupibafavorulazepu.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/sc_st_atrocities_act.pdfIn PDF document text
    • http://nadadeze.epizy.com/cv_format_for_job_application_ms_word.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_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 5504 bytes
SHA-256: d7fb61a5f34c054842e98a795a540dd38a751a7f92583120301a61a6cd82deea
font_01_sfnt_off0001118a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118A 11156 bytes
SHA-256: 5d72bb22b746fce8a8d2827a0bb2ba26b635e8154a8db741014a6a95d2c590b9

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