Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0428d69eccd034…

MALICIOUS

PDF

71.7 KB Created: 2021-03-22 22:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6edee58db9f12d9b48852cacf88f1186 SHA-1: 5efed619e12858493b4f3dc1166c2dc517e19ffc SHA-256: 4c0428d69eccd03403ed346da944912a81c928c4dcbe303fadc2ade009d51078
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=whirlpool+model+wmh53520cs-2 PDF link annotation
    • https://judewefa.weebly.com/uploads/1/3/4/6/134652715/noxasuwewinu_dijifuru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403685/normal_6007c236e01b7.pdfIn PDF document text
    • https://kebusivurokolu.weebly.com/uploads/1/3/5/3/135317059/7632857.pdfIn PDF document text
    • https://durunefa.weebly.com/uploads/1/3/4/7/134712847/694ccaa21.pdfIn PDF document text
    • https://nijegowililuxis.weebly.com/uploads/1/3/0/7/130739340/a87077153bc.pdfIn PDF document text
    • http://detonicinitalia.website/wifi_file_transfer_android_windows_7wjez6.pdfIn PDF document text
    • http://hyipinvest.site/mapleroyals_bishop_leeching_guideirtup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490528/normal_60501f046f0e9.pdfIn PDF document text
    • https://navolujute.weebly.com/uploads/1/3/1/4/131483334/70862.pdfIn PDF document text
    • http://kurs1.xyz/visiting_card_templates_for_interior_design0wyp9.pdfIn PDF document text
    • https://redewude.weebly.com/uploads/1/3/1/3/131379671/cb2315445c95c9c.pdfIn PDF document text
    • https://gununoneku.weebly.com/uploads/1/3/4/3/134309052/nosiz_zarazarap_pezaz_telukavekak.pdfIn PDF document text
    • http://iclod.tech/navy_seal_obstacle_course_virginia_beachlgrjs.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/7fced.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nowonovege/spreadsheet_php_scope.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_3baf1546f06c43e5af14f5c0022ce76c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/lozarozebomevowexelaju.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/3821834651.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/bikoxapel.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/baradi.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_3bc2ba65e204486eab1e9346fc3d3481.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_e7439710311947e4a5bbe6c3adf9c7cb.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_b640df2b5b1e49a39ecef1158f8c0611.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 5404 bytes
SHA-256: 59ed5e0e8a13d44115fb6e1a98bdf26ff04e3426dac20f5813486aa70abc7ccd
font_01_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 9908 bytes
SHA-256: 1716b11a3a241fab87cb3016d5e5d3543df64028d6a2de359522d34d897b81bf
font_02_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2