Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0aa0c62ee77d01a…

MALICIOUS

PDF

88.0 KB Created: 2021-09-21 00:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 403b523586f03611cc3c28ce42aae654 SHA-1: 9fce2a82effa7145b41c8ae316a425c6961be563 SHA-256: c0aa0c62ee77d01af401d9e5c9b87c1f105abda7b298f66d45082aecde0dab3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to various domains, many of which appear to be disposable or low-reputation hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish users. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely acting as a dropper or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://smidgel.ru/uplcv?utm_term=how+to+record+screen+with+audio+in+android+phone PDF link annotation
    • https://nuttydog.hu/ckfinder/userfiles/files/wiravawo.pdfIn PDF document text
    • http://sdes.in/uploads/31616894328.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/nodojirinet.pdfIn PDF document text
    • http://cx-gl.hu/images/files/61449732215.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/lamowapuxivobik.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/6890958863.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/85154886132.pdfIn PDF document text
    • https://coil.hk/upload/files/17452055492.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9g982s2q85pnjh2hb6hoqv6ap6/danafuzugobe.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/vewatufeso.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/migogenobig.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/dajejevon.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/13139293283.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/jeriterinufijeduxalotamut.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/63207901290.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/90628049633.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/51863483143.pdfIn PDF document text
    • http://fitviewer.biz/files/file/21660785264.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/kafogiva.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/67141324809.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/56133094778.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/99938081040.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_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 18988 bytes
SHA-256: 8602dde8d777a2167bc140306d935c428e2ae5fc80ff5e3f5c990e963ffe6ff6
font_01_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13929 10740 bytes
SHA-256: d66522b26de2e358e06df361b89926c32c8c25092d8df9ea0c33ec63c6e9c409

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