Malicious PDF — malware analysis report

Static analysis result for SHA-256 add74819e895481c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 16:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72594664738b7010d8aeecfad861e0c0 SHA-1: eb84247d4293e1798d4092b908f29d104722b3e2 SHA-256: add74819e895481ca4b3c8b900d84809586ae15287ac9623729cbb08a3e27bb0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs indicate a strong likelihood of phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=adjective+with+w PDF link annotation
    • http://sicompk.com/survey/userfiles/files/wurosafadiza.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/kujoximonemirikifax.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/gutuwozozumiremigisuxegud.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/lidod.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/76683269189.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210919_113038_133.pdfIn PDF document text
    • https://membermimpi.com/contents/files/48059662771.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/90928759346.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/36242380602.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/66915923493.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/mogofevusomezevogesuzove.pdfIn PDF document text
    • http://seamacros.com/upload/file/fevovanegege.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/53290347738.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/76087969193.pdfIn PDF document text
    • http://edeins.com/userfiles/file/vibelifaj.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/18964601156.pdfIn PDF document text
    • https://samudra99.com/contents/files/90734164045.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/wedarisuz.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/51233930279.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/93721206782.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc8452686---13127380487.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/neguxesow.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/79527403281.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_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 16664 bytes
SHA-256: f98e03ca4ed1cc800ffc8edd1e3a4dd7f5b6215c279fb520bb8d6b4bdec1ed1d
font_02_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 10032 bytes
SHA-256: 0f7769daf3e997b26c0087e49afc4ab16cea5b86ab744c2d1ef921ea19a65dc0

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