Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef462c401f98777…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 00:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8bdceffa8050e4c930fe384391e156b3 SHA-1: b50632caa81b3d7296574e68ffba99c1fbd87073 SHA-256: aef462c401f98777c48e3b39c122cc74008d9e56228c42b564e4a154ff761839
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external URIs, including a link farm hosted on disposable domains. The presence of JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=subway+surfers+original+game+download PDF link annotation
    • https://uetty.xyz/js/ckfinder/userfiles/files/60895811576.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/72988249112.pdfIn PDF document text
    • http://primaneighbors.com/userimages/zijarawa.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/vakubidovabaxetudu.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16136938b745ac---vutuzekifojemumiwapa.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/47637041831.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef6ad2fc2---vowikikonebavixem.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/joveg.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/37631286365.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/tiled.pdfIn PDF document text
    • http://mobil-tech.com/files/rulozegopanefogov.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/32805749415.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/53473241457.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/vuluxemipabomososef.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/34650472202.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/76017180662.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/61591692887.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/tosesufarezipefef.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/92777896436.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/090419202985.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_off0000ac86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49D 11112 bytes
SHA-256: 4261707f98238986746d4479f39b96328047046e150022f365c45de594aeae4a
font_02_sfnt_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 15720 bytes
SHA-256: bb1518e46b878170b4ba32fb8c86c1ade5a95eddd991f7ec46b75575a805890f

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