Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d988beeb46a0bf…

MALICIOUS

PDF

71.8 KB Created: 2021-09-10 04:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 233f77445bda7cae9f367803f4e50969 SHA-1: b5747e56f79aef1498ba119b7aeeb631280971fe SHA-256: b2d988beeb46a0bfb7e7c0ee5bfe31392b935021d23594bcba7bfbf52bdad4fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that this PDF is designed to redirect users to malicious sites, likely for downloading further payloads or engaging in phishing.

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://huntic.ru/uplcv?utm_term=download+game+swat+android PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qhe507r20nq679riqfb6dg19l3/46521374245.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/40928008930.pdfIn PDF document text
    • http://recrute.fr/files/files/nukilofuwafozidaje.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/degaseluderodatajuj.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/74824004919.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/reminijukelepifunus.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/59689210692.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/37039319979.pdfIn PDF document text
    • http://myphamasia.net/upload/files/86669829175.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/tujew.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/dibebani.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/kejupezebanavofuleseg.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/nobomiguxo.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/mubesugemupavoluwofekek.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/napetedetobapujabuxorivo.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/90688266857.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/leletegege.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/64616705206.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/96652591097.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/62496713992.pdfIn PDF document text
    • http://geotersrl.it/file/79404314250.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/bapubuxolod.pdfIn PDF document text
    • https://led7.ru/file/73683026984.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/96744716945.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/52139693392.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_off0000b8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C6 10680 bytes
SHA-256: e9e2b896bf9d6d2b05aa9919439886ef86d03da45ab4b3bd271bdf694eec5513
font_01_sfnt_off0000d112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 15740 bytes
SHA-256: dca25b31d0f1aff5d72b45380aa430692d081373c520e89c208b47ede6e85d5b
font_02_sfnt_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1