Malicious PDF — malware analysis report

Static analysis result for SHA-256 843bb8dc870e1c08…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 17:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c23927f56a44f0a014734252a15117ab SHA-1: 59e36f29fb5c736acb2f09c938e15488d0e305db SHA-256: 843bb8dc870e1c0849fc07f3bfe5f5c02873473faec6169d138e179b8de7a9d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farm heuristics further supports a phishing lure, likely disguised as a document related to 'square enix apk' based on one URL's UTM parameter.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=square+enix+apk PDF link annotation
    • https://zhansq.cn/upload/file/18624247591.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16142afaf2031d---mivezexamezutupirukirepi.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/rapedakov.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/92411730301.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/tuxudopakuno.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/zuxozegivefavazimodewip.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/23625262593.pdfIn PDF document text
    • http://gaudi.tw/upload/file/beripisedepubupifitisoweg.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/13179561154.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/dubopebipil.pdfIn PDF document text
    • https://linker.tw/files/17192414320.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/vobubonimuge.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/dipupemuboxedimej.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79320718879.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/72656900857.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/98890586878.pdfIn PDF document text
    • http://vasudevindustries.com/userfiles/file/setowoxomelebatilubotojoj.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210915_085336.pdfIn PDF document text
    • http://totoumi.jp/upload/file/regaxilijenejotesob.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/kokagaliti.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e24167528b---98003095239.pdfIn PDF document text
    • http://stylekd.ru/files/27414070711.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20210921194153.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_off0000b2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F0 16828 bytes
SHA-256: 73a66677e2ec790f96ea0812370f6d3b85b72e222ad080750771c34105e92fc0
font_01_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 10328 bytes
SHA-256: 638c4adaca68fbde37be7b50c3973f8ae7f2143f92b1b83d64f2c3c7824a164a

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