Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5e1596b44a003a…

MALICIOUS

PDF

81.4 KB Created: 2021-03-03 08:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b32fea42087404048f94ffa5fe672cf5 SHA-1: 7ecd2040e2f041f16d9caa91076d5690323aec5f SHA-256: 6d5e1596b44a003a365808b6d759ec317bc8e97eb3dfc4e24e2f6b004b741e21
134 Risk Score

Malware Insights

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

The PDF contains numerous external links pointing to disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload. The document body, though garbled, suggests a lure related to 'cleaning instructions', which is a common pretext for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=rival+deep+fryer+cleaning+instructions PDF link annotation
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/6731246.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/how_to_smoke_the_perfect_texas_brisket.pdfIn PDF document text
    • https://zoditivifu.weebly.com/uploads/1/3/4/3/134316547/rusapag_ladul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_6017988f6d2c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_602070daa3000.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/pugogemopub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_601dbb17e1695.pdfIn PDF document text
    • https://kiseridebajesa.weebly.com/uploads/1/3/1/4/131408791/pilalinevivolejaxoni.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/jdidgeP/61213267975.pdfIn PDF document text
    • https://ruxibudowivuk.weebly.com/uploads/1/3/4/7/134728491/dezizaf.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/sosupejuxofedo/seek_thermal_compact_pro__android.pdfIn PDF document text
    • http://fadowudi.rf.gd/muxujanufikiw.pdfIn PDF document text
    • http://worubag.epizy.com/geometry_definitions_matching_worksheet.pdfIn PDF document text
    • http://kobebosafuraw.rf.gd/how_to_write_an_academic_book_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/mapilonufurisadatisusuki.pdfIn PDF document text
    • http://kitojob.epizy.com/kesovadexaz.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/the_economist_special_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/85801002337.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
    • 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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 5492 bytes
SHA-256: 0ac624712cfb52d5ba3ad927fdfeffa895d11703340bfd672443ddf4951f3c7a
font_01_sfnt_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 10612 bytes
SHA-256: b1da619117f3540607f729b28f494f988ec41e0e480552dde19c13f38656d3a4
font_02_sfnt_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16132 bytes
SHA-256: 6c511cd2548aab1566dad8f54fccf2be4cd056cf5a4d5d56937977fde9165995

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