Malicious PDF — malware analysis report

Static analysis result for SHA-256 918c6af422bac18f…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 12:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bb8ce29f36bc4206dc0dff8656dffc7 SHA-1: 3cbcd3383c6e46c52e011ecd372255d0897a68e0 SHA-256: 918c6af422bac18f64ea322f7cb6eb37e5a5e77b429243e1b3aaf8713444d757
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure malicious links. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.sport-konyv.hu/userfiles/file/21425934736.pdf In PDF document text
    • https://espritgt.com/userfiles/file/82930703007.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lakutizonipibozudapo.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/58559686744.pdfIn PDF document text
    • http://ave-france.com/pics/files/domubafimuzovufades.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/vaminozubonigarepa.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/44200316220.pdfIn PDF document text
    • https://intersat.lv/files/file/kegikovizinux.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/54360152302.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210909_D6A0555D715AC692.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/ninejogadagawasaxos.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/60595448456.pdfIn PDF document text
    • http://tavio.su/files/file/72406245400.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db781ee4dd---sisimivukenug.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161405c94940c1---ruvopekuvozimuxux.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/xasaravomojow.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/vitulawamo.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/56239014203.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/20345902028.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210913012033.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/39420336920.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/33136153800.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/75489380310.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/mivomosabuzurek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=after+effect+download+torrentPDF 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_off0000b226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 15396 bytes
SHA-256: 4423ee2aa3dec8144b5169797e1127020201062271bbeb7fda75388e876584e4
font_02_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 10276 bytes
SHA-256: 486eb75311a93e44de7c5fe26bd7a4da27adbc1f6450f743ff81aaecea9bfe81