Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a8f81226b02905…

MALICIOUS

PDF

87.5 KB Created: 2021-09-20 02:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2e7133d984e95afadc4fa61a83e49f9d SHA-1: 6bea89c73dfac86954c9b91e7745c9df93246d7c SHA-256: 01a8f81226b02905a7da75f8719ed735b892b5a4565e92a5a88d49275fd2de8c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. The 'SE_CLICKFIX' heuristic indicates the document likely employs social engineering to trick the user into executing a command, potentially to download a second-stage payload from one of the numerous embedded URLs. No scripts were extracted, but the presence of external URIs and the ClickFix heuristic suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://medvor.ru/uplcv?utm_term=android+sd+card+not+found PDF link annotation
    • https://eric-parnes.com/ckfinder/userfiles/files/75015776971.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mojokisuguxodavuti.pdfIn PDF document text
    • https://alev.az/userfiles/file/17827365787.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuguboruzaxozijirakamuso.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/fibutizorir.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/rawapokuposuwisile.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/m7mgkdelf9ouh37fouh13o0l8g/35778201489.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/xinidupifoxadevovulituzu.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/gebupirub.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/35057496004.pdfIn PDF document text
    • https://premium-house.uz/images/file/11990830863.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/nelenugelej.pdfIn PDF document text
    • http://beta-rc.com/upload/files/66357814295.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///20264786798.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/tusabitu.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/ziposipoborodusa.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/vedixupodo.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/30008931925.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/xujigitileroweleni.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/32881091373.pdfIn PDF document text
    • http://toonesk.com/upload/99109361434.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/37074618193.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/49399771246.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdd89c0d62---90719957735.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_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 10372 bytes
SHA-256: 6524c551b55224d78e194f2ddf8744a2b160bc84a392f43d2ec1849ea60a8d60
font_02_sfnt_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 18420 bytes
SHA-256: f6f9764e9d158ed4d6694e5e56359ee42a84a24432bbb2ff647a64e12779a7a4