Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8768f150b17e108…

MALICIOUS

PDF

74.4 KB Created: 2021-09-10 07:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc1bfe77fe58900f6f141223684b4ec3 SHA-1: d9eb334d776e309f7de5afe154bfd9fbea70ef60 SHA-256: a8768f150b17e108abd6a2054aac35f72bcde657b4610f881132eb3ead6c135c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many with UTM parameters, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=mod+apk+of+clash+of+clans+2021 PDF link annotation
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/worazakolojunixiki.pdfIn PDF document text
    • http://apicn.net/upload/files/sosedawakuxires.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/ronoli.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/34716547216.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/pedagijutapew.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/diwisevojokuvavib.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/mirebixoroferozalifafiwe.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/vilireteteboba.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/wanepadatekifod.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/webopuxuperamurowak.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/zojofefokok.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kiduzekipidixopud.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/59044374209.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/joludukosuzexubozag.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/2897349297.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/38675925905.pdfIn PDF document text
    • https://maviet.vn/upload/files/17824393495.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/60303550135.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/50733653579.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613513cf036e9---15809995078.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/37303643975.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/kusalovozejusizomijor.pdfIn PDF document text
    • https://5uempat.com/contents/files/98940344944.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/letazinekugamudekidafowo.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/rikisugotulazu.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_off0000c074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 16660 bytes
SHA-256: f47f209f1154b8a34994ab9f542d61e5da5bbb291ada7ffc8fc6579036f59795
font_02_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 10672 bytes
SHA-256: 50f6a0bdbdb3078a88ee560f6062b4f08cfd5fb3097789d238de24f288c772a1

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