Malicious PDF — malware analysis report

Static analysis result for SHA-256 c034516aa0ad70e0…

MALICIOUS

PDF

86.1 KB Created: 2021-09-21 01:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56a4aaaab297c84fc472d1fe9fe445cb SHA-1: f9dacff35c65f0be811ef04c639e5f88d5443291 SHA-256: c034516aa0ad70e0c8b76fad595dbe2f667131590374d02768edef6d8f908391
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs, many of which are linked to disposable hosting and appear to be part of a link farm. One prominent URL, 'https://garglob.ru/uplcv?utm_term=download+minecraft+celular+android+gratis', suggests a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=download+minecraft+celular+android+gratis PDF link annotation
    • https://censcakmu.org/board/file/files/65155240323.pdfIn PDF document text
    • https://empresa-venta.hr/files/nazufuruzinikuwudalizike.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/9064179426.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8f28c12e---5498430509.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/6300149340.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/xugonulomewutozexi.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210906162033_2062480591.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/sodebugimorakosu.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/desozekufizubivetub.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/12572680276.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/jotojigulowi.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/xakutenojokexuziv.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/31081559077.pdfIn PDF document text
    • http://nanopena.cz/upload/file/29151644997.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/sepajop.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/givotolabaru.pdfIn PDF document text
    • http://ukrfirework.com/images/file/39226197716.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///202195217567853.pdfIn PDF document text
    • http://bluebossa.pl/files/file/jamubimejujekefakufuviz.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/binefazu.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/36960191607.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/e6395468e6df2a66f7bad73ec3326a34/38453436948.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_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 19032 bytes
SHA-256: 4da832c8b057ef948d8a1e93bc05879c75afe16bff78c8006373f6f7382ecc5b
font_01_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 11004 bytes
SHA-256: d53b57acc4a1ef986030eec6d329682c5d43e9927651e80b74530b95fa695e39
font_02_sfnt_off00013256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1