Malicious PDF — malware analysis report

Static analysis result for SHA-256 6309febb6e4cdc7f…

MALICIOUS

PDF

114.6 KB Created: 2021-03-13 16:37:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4e3e059c0288354f24041496055ee99d SHA-1: b081676080272f1eb03fec1548785337488ce58b SHA-256: 6309febb6e4cdc7fda9c69166dbf88268e93c6bf30360fd1092582c495c74653
134 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. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://gimoguvi.ru/wix?keyword=manual+impressora+ricoh+aficio+mp+c2051 PDF link annotation
    • http://2022god.com/mamudanuxeruwavefojini2w3yz.pdfIn PDF document text
    • http://rankingcoach-apps.com/genodedamifadebusowuo7s6x.pdfIn PDF document text
    • http://peskomment.ru/10_diferencias_entre_quimica_organica_e_inorganicalyi83.pdfIn PDF document text
    • http://kadabafomelu.66ghz.com/59450031229.pdfIn PDF document text
    • http://legko.travel/kekiguripepuetzar.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/216284957520yu6c.pdfIn PDF document text
    • http://reduslimitalia-official.website/79156674757db7mo.pdfIn PDF document text
    • http://solapp.xyz/surefezamatidqp2u.pdfIn PDF document text
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/xuzaxifuza.pdfIn PDF document text
    • http://ag-management.space/wargaming_game_center_macxxns9.pdfIn PDF document text
    • http://kolamudeluxom.iblogger.org/calibration_curve.pdfIn PDF document text
    • https://lukexurilewudon.weebly.com/uploads/1/3/4/3/134335891/993756.pdfIn PDF document text
    • https://jimiwijir.weebly.com/uploads/1/3/4/5/134525211/bozemada.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/zolaposafevero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_f27908449ec546439751ca4338d157b2.pdf?index=trueIn PDF document text
    • http://nijetazum.epizy.com/guided_meditation_joe_dispenza.pdfIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_344aab735cb4472d82f5556f27f966ad.pdf?index=trueIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_56300b6bfad64ced8744d33fe146fb47.pdf?index=trueIn PDF document text
    • http://vonimamodiji.rf.gd/kosulazinoxalutudedor.pdfIn PDF document text
    • http://talifox.rf.gd/columbian_exchange_chart_worksheet.pdfIn PDF document text
    • http://welerepo.rf.gd/65289991067.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_off00017c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C5B 5708 bytes
SHA-256: 6e7c15bc0cd2e7d5024bb1c73d63c10a8dc1c67a35c8467edcc4ea73d14125e9
font_01_sfnt_off00018fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FB1 13720 bytes
SHA-256: ad9ddd3d43c7587f67879768653f16c191c38227aca0ce41802cc4e66c46e325

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