Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bc2dc0676e416a…

MALICIOUS

PDF

70.0 KB Created: 2021-09-13 22:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: eede853ca32447e4ff76c89edef5e02d SHA-1: 8e000cb58dd93f2445b957490056322a2f4b5c70 SHA-256: 78bc2dc0676e416a5af49c1a60555e438bcfc204090b5ce95944990c6ac262c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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://inwebjor.ru/uplcv?utm_term=slender+man+chapter+1+alone+apk PDF link annotation
    • http://abwingstop.com/uploads/files/53274794939.pdfIn PDF document text
    • https://krusomying.com/data/file/2474822154.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/guxipofuzuvotabogu.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/visuzav.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/30808722327.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/mozifajekasakupimip.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133acfe3f365---lilubixofujoforari.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/4310261505.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161352a6bc7c49---rogalajutadagutegotonide.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/lofubuwoluta.pdfIn PDF document text
    • https://curvy.tw/upload/files/wijomogifovomuj.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/bupixax.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/63943919129.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/latujegejajevodekasegopiv.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/55432655102.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/bitukiw.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/67781284691.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/bugivivanisavamogidusewe.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/xizatenugu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb7cad72de---20097130861.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/2802548094.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/185679165.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/23050204874.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/kukodebulisemezupelikud.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/muzuwuxu.pdfIn PDF document text
    • http://zerosquareonline.com/file/64639304817.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_off0000b443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB443 15032 bytes
SHA-256: 362b7dbf368a0c4f52413b449b5e4e22b85bef0ab2ec6f89c02ddb9f57bcb73a
font_01_sfnt_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 10736 bytes
SHA-256: 1d0b94b53d49e839286af6583e57b5e10aaf87aabd0256e6af62fa5596c3060d
font_02_sfnt_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1