Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb0f658ce926063…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 12:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36337553d469bca1aae4cac30964d501 SHA-1: a5e9ed0dee249b0aa69a825faf8c3cbfb5ac9cf8 SHA-256: edb0f658ce926063f6c8b8318639c94e27e969f396ea15caaa9315a85ded3e80
66 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 ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to a potentially harmful site. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://pistant.ru/uplcv?utm_term=you+full+episodes+online+free PDF link annotation
    • https://loyallcanada.ca/editor_files/file/dugixuwudamitezamakitas.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/jewepotekatajaxufaxeje.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/76162102556.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7989ddcd0846f22ec71b66b643c3290c/65338019168.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/tozebonigogo.pdfIn PDF document text
    • http://haphadoor.com/upload/files/dudapaxamenifatid.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/xogedoxepolajojita.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/bubinepudaxarogexoji.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/vapejadi.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/kugubolagijipopaxigepefek.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/giduwotedu.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/11612940646.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/rixajosatunobig.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/55641178988.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/sigidiwu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613942d86e3a9---voguwamata.pdfIn PDF document text
    • http://biosite.ru/images/news/file/18839481021.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/25094539732.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/pekijeji.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/jomoxufukokixasuze.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/piroxojevugosutudiko.pdfIn PDF document text
    • https://topupdana.com/contents/files/sijipodedefekezomukodata.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kadidipurivonutimuxosiw.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/91318971463.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/94678874823.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_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 17436 bytes
SHA-256: 404c507c3b581c5a1c725b7fc2eb433cf1ff41902c75c4027c6bb2f5e3c0a168
font_01_sfnt_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12642 10316 bytes
SHA-256: 3b1c29291e8562284b50376e1a531a3c01fd862445c837464299c80b2375fe4e

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