Malicious PDF — malware analysis report

Static analysis result for SHA-256 488a39c15dde845f…

MALICIOUS

PDF

107.8 KB Created: 2021-09-16 02:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fcd27b15e97cff971af1e7082162a12b SHA-1: b5797b576955d13c37be685b12a42b3610fd32dc SHA-256: 488a39c15dde845f9d430a332e42fe525bcd1d7425a37fb40dbc9d4eccfb1ccf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://infrive.ru/uplcv?utm_term=play+gba+on+android PDF link annotation
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/93127317201.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/78149355637.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/60529545644.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/tifaxavevodido.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/70298443677.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/diximiniwavotidepodiwapa.pdfIn PDF document text
    • http://fitviewer.biz/files/file/roxewixibelop.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/12832400553.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/fokuxivavi.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/88474697000.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/44148226038.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc8beaabd---digowozavikifoso.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/60493494970.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/9931644004.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/vazakul.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/detejosuxotixudutateba.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/30858825121.pdfIn PDF document text
    • https://jck.ro/userfiles/file/52182284387.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/galagunanukava.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/53143809540.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/15117196184.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/9649602415.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/78124539508.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360479160d1---35958739636.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/81329402244.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_off00014311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B28 10280 bytes
SHA-256: e66f8b782d11031eb61cd07d6dc3d1d40a6d32038bb11d8841e768a8f42ac561
font_02_sfnt_off0001721e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1721E 18372 bytes
SHA-256: 8259c3cee6b209ee0c34aed6b962393303a48d974fd296b18f8784701a7c1ead

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