Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc925ef41e735f55…

MALICIOUS

PDF

147.0 KB Created: 2021-02-22 08:02:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 326a834b9c6eb457065a2d50424160a6 SHA-1: 816fe723dd96cfee981c04f01776dbc49201d3b2 SHA-256: cc925ef41e735f5589bce3065eca1898c8e197f444aff8e682cdd579c9f7ce3d
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://maypoin.ru/123?utm_term=nail+salon+open+late+sunday+near+me PDF link annotation
    • https://batezumepew.weebly.com/uploads/1/3/4/4/134479003/fefali_gebozereg_xebufenezujov_dugisivu.pdfIn PDF document text
    • https://ritiburup.weebly.com/uploads/1/3/0/8/130814353/56b6447b0fb.pdfIn PDF document text
    • http://tovelksa.website/60385082933drxv1.pdfIn PDF document text
    • https://jawizadobem.weebly.com/uploads/1/3/4/7/134773472/keruvu_wekorudixaba_fejel.pdfIn PDF document text
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/cf203e3a14.pdfIn PDF document text
    • https://zijolafazul.weebly.com/uploads/1/3/0/8/130873795/394715233.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/9324416.pdfIn PDF document text
    • https://sunozidugeb.weebly.com/uploads/1/3/4/4/134486191/08a56cdf.pdfIn PDF document text
    • http://lienforkid.com/60567676105nxow0.pdfIn PDF document text
    • http://hesap-al-sat.com/bevesixamefikoj86usc.pdfIn PDF document text
    • http://vannlight.ru/nbc_sports_live_premier_leaguevqu64.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/kinosoxolalesik-debipukiruroti-pikebaxenopuf.pdfIn PDF document text
    • https://tagewojozupuk.weebly.com/uploads/1/3/4/3/134358966/2742602.pdfIn PDF document text
    • https://zolotamazuragif.weebly.com/uploads/1/3/2/7/132712333/4ab884.pdfIn PDF document text
    • https://pibowalemarume.weebly.com/uploads/1/3/1/1/131164440/vekezulapip.pdfIn PDF document text
    • https://wiguvufa.weebly.com/uploads/1/3/0/7/130775639/dotigakitomov.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/452603.pdfIn PDF document text
    • http://tonadep.22web.org/koli_banjo_music_free.pdfIn PDF document text
    • https://xigukiburid.weebly.com/uploads/1/3/2/7/132741693/biperagoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA2A 5176 bytes
SHA-256: 22bd390845d47358ce04e1daf56ce490c77706748571c4608de752faf36cfd2f
font_01_sfnt_off0001fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBBA 13800 bytes
SHA-256: 84c5bd491bdd0e3abcba23d2dbd086e10c13ac9e55729cc200621248247d3ed5
font_02_sfnt_off00022909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22909 16084 bytes
SHA-256: b4071eb911d8dc62449cbe34e7b91a69a4d2916191845e014595e4e5e6ec2879

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