Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d50fa4d1609cff…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 03:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a39c155c65332fb2a70b4beca2146aaf SHA-1: d1821b6cd8620da54fb0f83c402253b9ad70efa1 SHA-256: 80d50fa4d1609cff2937366cc24b4d1e12c257b25a8a283696b09ee7fd93a97a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://powerfalcon.net/uppic/files/nokojidulale.pdf In PDF document text
    • http://patp1ryb.ru/media/file/33283717249.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/12514402024.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/64548950691.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/butaru.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/xukopagarerakisagoxi.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/56448891621.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/jerilojibij.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/21272569823.pdfIn PDF document text
    • http://becucci.it/userfiles/files/15189295369.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/ginadovetiset.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/692b8441ae81f2ca7a7921e0673daf1e/nulotowudopuzazeli.pdfIn PDF document text
    • https://novsport.com/content/File/jubamatajokozedixolidafuv.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/22904764931.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/76383173483.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/xijuwunekapa.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/1110470006.pdfIn PDF document text
    • http://cabini.it/userfiles/files/19746590368.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/felidav.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/fatewaxan.pdfIn PDF document text
    • http://freetds.net/userfiles/file/doxabadufu.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/vasubotopukafijun.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/16778112652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=plato+games+apkPDF 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_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 18200 bytes
SHA-256: 80d2c980a5782b1c7918bb67357f4eb214274b2696b284d7e6338ba75642fff6
font_01_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 10392 bytes
SHA-256: 2129ff66c4f389ab5a90c93d119c3ba9e59daa2be34df4f2ded5f7a7cc680922