Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e5793d7bdb84d0…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 05:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 904296f63fce6b8bfb9eec6d3a21e5c0 SHA-1: 6c2c769a16320544d405e76cee6ff89459612220 SHA-256: d8e5793d7bdb84d0228b72635979c63aa3cca486852fe36afbb802aa3cc4e779
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary goal is to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=websites+to+watch+indian+serials PDF link annotation
    • http://hflbdq.com/uploads/file/011233422355.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/24852284390.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/tizuzoso.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/gudilazidideduwibuwebif.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/roputamul.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/tibapazilonogijokalowet.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/27804011749.pdfIn PDF document text
    • https://istanajp.com/contents/files/dizagoritulel.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/34685149459.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/nepuzemukurovelimobamojo.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/31175351663.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/funenelinenunop.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/83074179598.pdfIn PDF document text
    • https://acatay.daynexdemo.tk/upload/ckfinder/files/98845885523.pdfIn PDF document text
    • https://edex.co/userfiles/files/8834071938.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/49112250290.pdfIn PDF document text
    • http://chromavials.com/d/files/83378655248.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/bifaludowekobumifobagit.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/92810261959.pdfIn PDF document text
    • https://tpk-m.ru/files/file/fitimojivuzewuji.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/nusupexubizusawi.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210925082053.pdfIn PDF document text
    • http://vkts.se/userfiles/file/leraxesuk.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/jowiniguvoru.pdfIn PDF document text
    • http://annabarons.com/files/files/fexeru.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_off0000afbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBF 10684 bytes
SHA-256: da4b77dcd20afa0e9fa589910ae79ec476604f1da1fa548badbb5ef99e9efc89
font_01_sfnt_off0000c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 16004 bytes
SHA-256: 49b233c88d8c3cac9062eef49a355db5eb8a930a292ac197970ae95d75690209

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