Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb01cad487edc11…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 10:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf2c96ebd4aa8a23a84d3b0b0a9fd853 SHA-1: 322f67975a9f67ef5c54c2c826222c6ce39b9298 SHA-256: ffb01cad487edc112c09e6b2da0791f9f1f7d1beda8beaf2811e443a46a40a9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=windows+emulator+for+android+tablet PDF link annotation
    • https://gamaconsultores.cl/upload/file/72552280003.pdfIn PDF document text
    • http://olapromos.com/ola/uploads/editorImagesfiles/vonulejademukupiluduj.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/zejekoziwa.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161409583920b1---rurisumup.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/89295593994.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/29169200673.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/gemitifinusuv.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/mixiz.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/86988707208.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/kelukipurapofitabo.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/kopulujipalorijasub.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc8d58162---47992126579.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/lizon.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/12664544170.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/7841970104.pdfIn PDF document text
    • https://zzhqhi.com/d/files/fulunokosisobe.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/93481453879.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/kevewotigo.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/11342566969.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/gudugalidigon.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/90227077348.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/xomuxenesugosizodizorujo.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/20527968118.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_off0000afd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 10836 bytes
SHA-256: 6f79d9c67d8ca4f3596baabeb28dd4a3b2f5a7112bdd0ed926c0a9200a6f61ea
font_02_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 16368 bytes
SHA-256: 9fa1f4e94c33d9564e9e3a80b57d9e425d1c81832e4ce449a64d1a2239b50188

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