Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe05dacaa431429d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 13:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36f3a7c04adbcff60ea632a9b14cd73d SHA-1: fc839f388bbf681b93b408ee91775d435d618e53 SHA-256: fe05dacaa431429db04b19e392a0de339343e034b27d5dac438080dc318c0761
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the presence of multiple external links points towards an attempt to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=moto+g7+update PDF link annotation
    • http://dailygameresult.com/editor/UserFiles2/files/fanudurufumapi.pdfIn PDF document text
    • https://italvaping.com/file/89445553455.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210910124256_forge5.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/xadagunefosijoduzabupal.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/dasijezakixi.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/91910070550.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/mesoxewa.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/49001203567.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bccb55994---4823125715.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/15000906375.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/mademenagaxo.pdfIn PDF document text
    • http://www.centralperdana.com/file/xadilejonazefaxenepajag.pdfIn PDF document text
    • https://ptogel1.com/contents/files/30997039926.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/fuxuler.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sjj8oslu5he7013i8n2b9p3pn9/47522861234.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/46473502312.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/puvasosudukopudijipabaz.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xemaxubovujowusilof.pdfIn PDF document text
    • https://eniedu.com/data/file/20210914182900.pdfIn PDF document text
    • http://anpharma.net/upload/files/98464685445.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210905_140433.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/tusewi.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_off0000d4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 17752 bytes
SHA-256: 46f7051d1bc169bce99a6dd74529435217333259cb627a701e08b51ad7b8e93c
font_02_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 10200 bytes
SHA-256: 1ef07528a65e1db8cccf547ed97f5867cf07df811668a49ca957ddfbce695860

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