Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c78b846208e42f…

MALICIOUS

PDF

68.5 KB Created: 2021-09-14 05:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c45559dda4538b63b63a335763ba8148 SHA-1: ce53cd1f101f2c4b0ba30e709f4f8db9cb99e459 SHA-256: d6c78b846208e42fd0c35cd6af1f4f2015125f2ed3f15dab681a94ce9903f811
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable actions, typical of a screenshot disguised as a document. It contains numerous links to potentially malicious PDF files hosted on various domains, suggesting a link farm or distribution network. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely involving the redirection of users to malicious content or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://orvositudasbazis.eu/images/upload/file/narusaxumivupogekega.pdf In PDF document text
    • https://deesudcoolingtower.com/userfiles/file/79242265940.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/wepoda.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613344402d4be---xukapivetizijes.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/26869921058.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/fisalanuluzakuzekig.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/begujamuvare.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/67684155992.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/boniwuvotexedogosaveta.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320a1ab3efb---50032981662.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/54071118151.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/lapivimepapagavetaga.pdfIn PDF document text
    • https://hobbypet.cz/files/file/59019577722.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/pakovedukimero.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/jetolodexugozisu.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/nekozebeminiw.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/13193590917.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/bamutunogesemu.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/23524304014.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/wadoruwimekajuvagax.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210904_043542.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/15809826975.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/77228587609.pdfIn PDF document text
    • https://atiksigorta.com/files/gugizarojovo.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/66898213397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+remove+audio+from+video+androidPDF link annotation
    • 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_off0000b123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB123 10544 bytes
SHA-256: 7bbc8705ad8a00a623bfbfaa6f186fbc77c10d50fe1faba57ced88f97d8e3e64
font_01_sfnt_off0000c924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC924 14172 bytes
SHA-256: 7458bb09d16accad91cb4508e1d0418279a27871b868d4094351bc0afd84502d
font_02_sfnt_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1