Malicious PDF — malware analysis report

Static analysis result for SHA-256 53dc3a9724d0c750…

MALICIOUS

PDF

70.5 KB Created: 2021-09-17 11:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0811131241e5ecf0a452d5d821d6aff2 SHA-1: 3b02a3ee63fbbb42bbe9aa8ddc3bcef89c0fc7bd SHA-256: 53dc3a9724d0c7503ffb9d6d9be9581de8486dbe78fc6e759261f0fd414f45ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=best+multi+language+keyboard+for+android PDF link annotation
    • http://americasbestwingsbeltsville.com/uploads/files/nedarilodirudekoreduwipi.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/tapidejobagevaf.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/33f28700134f3f9e32da62604f88a868/lebogebifumabatewenig.pdfIn PDF document text
    • https://tablouri.emilianchirila.ro/imagini/files/tagemofazo.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/68161642636.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/gekofi.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/xuwexilevijoluteve.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/xafixizizorotaduwedix.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/vujukudunisuvuxatetiwasa.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/53320695524.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/89405242583.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/8716715987.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/nemokanuxaji.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/jokuvexugopuwasetejoto.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/zemonetobiwavujixifuludox.pdfIn PDF document text
    • http://vhz.cz/user-files/fenadadidap.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/70267738717.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/wufik.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/buduzagapux.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/dojoxuzelutuzetivasovop.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/25429246455.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/59600061041.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_off0000b37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37C 15140 bytes
SHA-256: d14bc24697fe3208887ffa6c507b9da59d70f0b1ecedf68eb99e44238f666088
font_01_sfnt_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 11196 bytes
SHA-256: 6b5e4547e9f3f514c3f706fb9d42696837d028bb61ad47da256a8a86c0a8c7a9
font_02_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.