Malicious PDF — malware analysis report

Static analysis result for SHA-256 3672cde08fb7aa28…

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 12:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 63be59d5c5a003648a3f6ceb603d98c5 SHA-1: be9c8e40351cf3b534a5f18f434abc5653ae51cf SHA-256: 3672cde08fb7aa28c01ddeb651e292aee28367f1de5c7a9f920b4708b6efc270
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF's structure point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=how+to+set+monthly+reminder+in+android PDF link annotation
    • https://sooryasales.com/uploads/file/79872645884.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/65540472438.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/5210036347.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/96172152272.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/riwefapemiso.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/78467609533.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/97566693519.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/keragawamefukone.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/luxopotegun.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/73871209395.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/depapubevixotolete.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/saradapogenetofubazatowu.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kibujojomatigikixalemikod.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/wixewakefo.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/jevisasifofiginevof.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2b4804800ea1d2ddcf005e0348cfe01b/vununakepewipomugujom.pdfIn PDF document text
    • http://teresachild.com/upload/files/gagenijeda.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bf66de0d591deb28610943196c7032c5/1539116740.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/vazivinolegelola.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/rupinidavejev.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/98430567927.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/jajoripatav.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/gofolusifovojokam.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/14209415714.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_off0000b601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB601 18084 bytes
SHA-256: 80c92efbc9621fbec7451ff3660c5d0aaa8bacba664cbcea6b61904dadf387ec
font_01_sfnt_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 10704 bytes
SHA-256: 849af97b8641b3e90383f43078722dfb52b763d2e22e6db066da3578d1c7c8b6
font_02_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1