Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a8d238dc62c551…

MALICIOUS

PDF

86.3 KB Created: 2021-09-12 23:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7c1dcd3157085ab987d29576c10019f3 SHA-1: 824bce70a019e60e9a480f3e86f1f199625621b1 SHA-256: c9a8d238dc62c55146502fbd4cd188fc68314b24fcc51f66f50307e37918c681
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The presence of external URIs and the overall structure suggest the PDF is intended to redirect users to malicious websites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ibtaker.ps/userfiles/file/30338703049.pdf In PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/45244440495.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/54b4902f514fc43a1c9adc4a21a15b87/46850132851.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090922335273499.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/23578412691.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/41709515053.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/zonumos.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/43409014372.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/11513105747.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/fawokodaxapuxifisur.pdfIn PDF document text
    • https://ijp2.com/contents/files/zixovogedezalenik.pdfIn PDF document text
    • http://airzo.net/userData/board/file/kewinikudekavibopovonodim.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/23794701106.pdfIn PDF document text
    • http://vladekoservis.ru/files/66969586066.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/71583986159.pdfIn PDF document text
    • http://stylekd.ru/files/toxonomokazovidenurubon.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613560417e635---mirigurazuxexovubivez.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/vivokelufax.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/43449440736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=watch+after+we+collided+full+movie+onlinePDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/33149283479.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_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 10816 bytes
SHA-256: 1307a57ff6ab57f0b5433217d57abaa7095af1904b6a6c276d6860946be36f55
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 18304 bytes
SHA-256: f8f74b2e81a5e49938cfdaa42a7b24ea288fbb3ff6d2008270110c7994377eda
font_02_sfnt_off000133bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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