Malicious PDF — malware analysis report

Static analysis result for SHA-256 653a84a7086d3210…

MALICIOUS

PDF

73.9 KB Created: 2021-09-12 08:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e2e7349f91d5460e194795348b11c6c SHA-1: 4adb8b2f4e67be8924e2408124cab615b2c9e22f SHA-256: 653a84a7086d32100560b3f1be4ae5f7ed3893b49a4f2d2001eabf4d02543d84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=online+free+tv+app+for+android PDF link annotation
    • http://ballarioarchitetti.eu/userfiles/files/gutobarupadez.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///sewiju.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109040522529185.pdfIn PDF document text
    • http://briztravel.com/upload/files/66757766428.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/28416256159.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/bogebobejanabisamokexap.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/55184516565.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/namifo.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/dotodikamevifozurikige.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/setasowaboroliguvubepow.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/rosimulutusabevexalof.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/mimikokalesevukelazugoni.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/47710288342.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/96090553808.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/95465833368.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/10564947285.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/20883519746.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/90430424211.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/refatagafinevigabu.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/zajobufojanusofagu.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/81492216666.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/xonixumaj.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/1vq7t4dlhaenivbs3l7j3mb2q5/bowutaj.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_off0000c089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC089 16308 bytes
SHA-256: dd9e45e54d602398a238f4a00cf2a0a88eee44a3b9184c1a6862039418125654
font_01_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 10412 bytes
SHA-256: 3c696c50806a92baaa09f649d980252a324fd467d1b0fd654886b075a391cae3

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