Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf876a72b5e380a…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 02:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb6a1f5f4c381551418908fbbb810a05 SHA-1: 295b1eee56e67abd9913816338ba70ab716ae9f6 SHA-256: ddf876a72b5e380a3bb3245692b54df9c8852a6a68da8695dfd077a1cc979515
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting it's designed to lure users to external sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://stphilomenaonline.org/userfiles/file/pezegifedowafogoma.pdf In PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/6795415989.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/koguzapaziwumevidokifo.pdfIn PDF document text
    • https://etadelloro.it/images/file/48055147290.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/b9e0fe43233ab7a2435553bdc208bce6.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/41989975157.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/8127810391.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/jazapi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7978fa70---85327659102.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/napasakilosopu.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/64217699192.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0709d38e5---nazolewurinawidifoba.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021921052137504.pdfIn PDF document text
    • https://clickbox.ro/images/file/nenonuzapavidepigonadiko.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/fukivobojazizefumibarijev.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/68210066004.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/85340656525.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/60688789540.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/19605197046.pdfIn PDF document text
    • https://ferropula.hr/files/roxigawogenegowakog.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/33710854994.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/71493870832.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/jixedefuwekivosix.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/25381483051.pdfIn PDF document text
    • https://venus-forever.com/image/files/18792164549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ministra+player+apk+firestickPDF link annotation
    • 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_off0000b09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09E 10552 bytes
SHA-256: e3ba944e76eff04b4a449606cdb879c137a1cc74956dbb99c3a76e12f7173fc0
font_01_sfnt_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 17088 bytes
SHA-256: 619fa4124f6286670c651bb48f1c712c81fccafa68906b2137bff874c1894398
font_02_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1