Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bf66ae0a0df120…

MALICIOUS

PDF

76.8 KB Created: 2021-09-28 16:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c2b0b573472a0c6340fc096dd83fc487 SHA-1: f1c8bc0cedc5f96fbaab09714e1fab33f9c92d54 SHA-256: c9bf66ae0a0df120452fda8e729881532fc113dc16ae7bb26ad7546a73e003d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of embedded JavaScript and numerous external links, many pointing to PDF files, suggests an attempt to redirect users to malicious content or phishing sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further indicates a pattern of using disposable hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 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://archism.ru/uplcv?utm_term=how+to+transfer+contacts+via+bluetooth PDF link annotation
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/difan.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/91250054696.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/busoxagikubazemi.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/61911311765.pdfIn PDF document text
    • https://3visiontech.com/piceditor/file/87298915181.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/21170147451.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/virunekelivukomugoje.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/mabibe.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/jamosadexope.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/guxez.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/wulilanulopusifoxux.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4aaa7940---35100150269.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/dunitoxowominefamitep.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/64100336962.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/dofuxegeze.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/fefejemasozexujenasof.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/51424328987.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/fepajerovew.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/turigatimufenubevuv.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/kakizafitife.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/86804759938.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43177874737.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/jazexofixadilonaxeb.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/pozediwone.pdfIn PDF document text
    • http://adm.stikom-db.ac.id/js/uploads/files/53485758195.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/torofubokanidorirujope.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/vozifegojopigololamox.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/73251537754.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_off0000c07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07B 10816 bytes
SHA-256: 5a4988290e7bba9d5469cbc9aba64f4eb2664afecd8eb66c18727d97b2e01fcc
font_01_sfnt_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 19728 bytes
SHA-256: 15f4c8f0e87c23ab03f6f2c1c98b179838f722fd5532a430b3b18d17fe0f3c5b