Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8524eeed0b7b3b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-13 15:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 15d76525f7db483bcd8d497e5f462cd2 SHA-1: f6810bade140b2350031e51afad2957510c31dcf SHA-256: 2d8524eeed0b7b3b0f783618f1f56a4e8931eae564afcbe7e1419c274444b627
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that point to external websites, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to distribute content or phish users through these links. No scripts were extracted, but the presence of multiple external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=xray+1.7+texture+pack PDF link annotation
    • http://www.lebedosapartotel.com/data/yukle/files/wamubizofexemugavef.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jusol.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/potupezakudog.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/xabojaga.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/torazamafamupu.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/lotaxifen.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/3200981152.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/5974821356.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/31408507409.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/45577487701.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/lezonadijof.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/59370433442.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/70653724852.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/14156220348.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/73882459701.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/15800428806.pdfIn PDF document text
    • http://mebco.ru/images/file/9386348781.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/rejefemuf.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/59184917743.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/paruketolifisisel.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/35595406581.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/momosekit.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://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_off0000b4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B9 10420 bytes
SHA-256: 2ff16af7a461742976c5f10f2f2c1314af5a6d4bb2f49532ed4def3fe8f0b8ea
font_01_sfnt_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 18240 bytes
SHA-256: c1c585426d69c57034d2fac454b9083a72716cacf1e340d7c6e54ee0feb299a9
font_02_sfnt_off0000fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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