Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca9e22051b39f83…

MALICIOUS

PDF

72.3 KB Created: 2021-09-22 10:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8ad3f3d69e9a87387e2946e46834e80 SHA-1: 05a93854b14e0d2978592c0c65af7d939eb0886b SHA-256: aca9e22051b39f8303ae1b3b5436b7fb69f1dc2bc0d872a70e7630f79845761a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF also contains a large number of external URIs, many of which point to disposable domains and form a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://deesudcoolingtower.com/userfiles/file/gemow.pdf In PDF document text
    • https://altsovmun.ru/userfiles/file/21927060194.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/36117227072.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/89933605597.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/36827051224.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/nebatexefosowutaxa.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/verigosimisudigesutoren.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/nozema.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/devitafisunoguru.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630766280/file/zojaxud.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/84934213808.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/semefidilifasavi.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/11654525427.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/dedelefidemebasanakosonu.pdfIn PDF document text
    • https://kawanmto.com/contents/files/bosifagexu.pdfIn PDF document text
    • https://businesslife.com/content/files/24864090716.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361f6549fe7---dowuvijunomupumifis.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/jokiw.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/12405968bf1852d5bbdaa7655ed8363a/39460478591.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/kipuvorusilukexigerofi.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/basuxaxodexumeturi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+remove+recommended+apps+in+play+storePDF 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_off0000b5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C1 10932 bytes
SHA-256: 0b4a02b4e98fd4eb3d928588bde99915a13967228e52b94d23dd9409cc895980
font_01_sfnt_off0000cf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1C 17084 bytes
SHA-256: f7f9d0cbef38fb6679ff3553ffbcf11a738289eedc6f1c4e570e545a269d93a5
font_02_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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