Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90c9e3e2b0bab88…

MALICIOUS

PDF

73.8 KB Created: 2021-09-28 03:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ef75f7785cc1e6db2c987ce868fbf94 SHA-1: 1fe284be4477b4f568c9b298b9508b2b2553e9c1 SHA-256: d90c9e3e2b0bab8834dc8637c70a6acaa1327538a1fcb4b2fb74fac803404385
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 ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=secret+video+recorder+pro+18.6+apk PDF link annotation
    • http://pscworld.eu/ckfinder/userfiles/files/34002767959.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/rapodigefolunememato.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/vivageg.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/eeqb5e8l3212dsvb7p3sbbbtvp/87881495126.pdfIn PDF document text
    • http://net-marketing.hu/images/files/10370532993.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/dizilegetumax.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/89924928815.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210926135901.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/vadexelenuwuvetulujube.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/88733837774.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/vewarer.pdfIn PDF document text
    • http://hmed.vn/upload/files/lemorufedij.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/93369978006.pdfIn PDF document text
    • http://melabo.com/upload/files/94861913480.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/29016658116.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/lafozusegaxoxaparom.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/lupajomonazejibumapisido.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/negeduraremu.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/bedaxijoroji.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/kitidinimekivozekad.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/56422142771.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/ravituz.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/voxadetegos.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_off0000b4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 19840 bytes
SHA-256: 0f8eda608e2600b29bba3725a3411dfb9fc11ed0b17d76b75f0def4d85f69e8b
font_02_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 10916 bytes
SHA-256: 160284a4a7b616801dd899548d39b7e640343e7b796633319b5c2da4b1708ec5

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