Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d9972d31d275f2…

MALICIOUS

PDF

89.9 KB Created: 2021-09-19 03:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5cda8690d933909fc9b0a72711a575f SHA-1: 3296970afb08fe31505168b88c0c3a4688020c4b SHA-256: d8d9972d31d275f2d7533821b999bb944fe8e4365a5d6f4b9ae5f5bf2aabb48b
174 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests a social engineering attack where the document instructs the user to execute a command, likely to download and run a secondary payload. Embedded JavaScript and numerous external URIs further support its role as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=best+minecraft+pe+uhc+servers PDF link annotation
    • https://rkdestate.com/userfiles/file/88365312638.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/86610692907.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/nozarezix.pdfIn PDF document text
    • http://hzqzg.com/d/files/mugezapexagowanux.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/filoj.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/64568460718.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401c055af44---xomowazusabo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134a03f3b495---kikuxowegexizikezosabix.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/josujapidisurikezi.pdfIn PDF document text
    • http://boki.hu/editor_up/37461221891.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/foxebutukotanivudujeruli.pdfIn PDF document text
    • http://toroisg.com/public/images/files/wixisaletivijuxezavamako.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/muxetosebipopopawexafi.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/53184037100.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/45155872816.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/23666198704.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/18189145769.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210917034135.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/vopupubugatetatosog.pdfIn PDF document text
    • https://emenu.hu/editor_up/49489697005.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/69939583575.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/43080401325.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/jokuvexugopuwasetejoto.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_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 10796 bytes
SHA-256: b0c625378df508dd8feb45403948c4ae78eccb4d49d67e75f78d164a4d06c4d5
font_01_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 21172 bytes
SHA-256: 2fd83a1057bc756cab4fc9a61473c9684a76ea06dd18b3b098f98800c0f4f3a0