Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7400bd348a2f6a5…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 08:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f2f3c225b4c10d3da85addcb24b893d3 SHA-1: 677251de22f370ef85e985581ee4fb15941e7cf8 SHA-256: a7400bd348a2f6a5d42f6523a580acf4ae9f4b2189d40f39b1a2c18b114ae38b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score support the classification as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=shqip+tv+app PDF link annotation
    • http://pozitron-s.ru/userfiles/file/53752286240.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/82374007194.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/6669068880.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/mojixegumavaxobeb.pdfIn PDF document text
    • https://davaocarrental.com/images/file/87444693174.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/sunutibolufajuweduwox.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/basitozedavezupi.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/10910296673.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/movedumoronofobimolonider.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/65970653594.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210914001347.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/49013637742.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/27824086294.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632874682.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/kigazevuxileke.pdfIn PDF document text
    • https://tempegaring.com/contents/files/bidifilima.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6d88b934---94402887544.pdfIn PDF document text
    • http://aprt1day.ru/file/12440779607.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/80880050647.pdfIn PDF document text
    • http://pronobile.com/catalog/file/45797925317.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/vukefedemumevu.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/35093350552.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/nofonesanowus.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d57f39ff43---79785872339.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/4892719118.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_off0000b50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50F 17044 bytes
SHA-256: 8bcc226acc5944814ce0d15f05b0062d393695915e89cdfafe860834ed09e63d
font_01_sfnt_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 9968 bytes
SHA-256: a9e3e6fad306cfe34f1dedb4bdf26440bae3e9c65c9ca46bfe9bf9c0770cbfce