Malicious PDF — malware analysis report

Static analysis result for SHA-256 9890b76219077dd8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 12:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b8790e93256aafc6b37b631793a81fb SHA-1: 4aabff12ff3261c3133e65834bdb5c23fc69522e SHA-256: 9890b76219077dd81c9c4e32d780acbf8907c3d4b9dcee91ce07466d984748e7
166 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, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be instructing the user to open a password-protected archive, a common tactic to bypass security scanning. While no scripts were explicitly extracted, the presence of external links and the overall detection profile indicate a likely attempt to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wastran.ru/uplcv?utm_term=phone+flash+app PDF link annotation
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9bc622b0---mifisopo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210906180315149.pdfIn PDF document text
    • http://sushi-belovo.ru/files/nobofilubesuzemodo.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/gereguleweramidudabu.pdfIn PDF document text
    • https://rippa.pt/files/file/limoferuzoronarek.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/tunidorojejogeripi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/08b9c384133e519c3bd89905c800281c/falawatabigiramis.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/sakekukaju.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/dufok.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/82065601702.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/42972803568.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/jasukutij.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109021201327514.pdfIn PDF document text
    • http://askaudit.ru/price/wijinexudigurasuweliwomas.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/37054488063.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/93038787696.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/37064098235.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/9130838044.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219101736392319.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/vixunagapejexifeka.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/ninovova.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/78464210459.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_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 17804 bytes
SHA-256: 11284de85ba9c2a79fd87ce67b59e8d2ea6a51e9b6fa61be9a939b6900e372e1
font_01_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 10168 bytes
SHA-256: e6fced3b105e53d5c50736f964018e82d2a25c3848bd0e4fa35798f6f2fb3ae0
font_02_sfnt_off0001213c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1