Malicious PDF — malware analysis report

Static analysis result for SHA-256 a484506023c144e0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 13:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 204780efb9332cc514f6598ad8857080 SHA-1: 3c654d3887e3e639012da26b002a38152bfc65e0 SHA-256: a484506023c144e04dfb8a67e1392c57628edddcfb939baafcd583190ce4461a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the true malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or lead the user to a phishing site. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://honeycontacts.com/uploades/userfiles/file/tenixalen.pdf In PDF document text
    • http://piqiso.ru/userfiles/file/41513429081.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/kikabarego.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/vuxoroxofemexulunagebizi.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/puveduzitabalemipil.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/57068878184.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/gagaziwoxakijusa.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/28245885812.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/wusuteporadeponaj.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/89569711672.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/76315526455.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/51151740230.pdfIn PDF document text
    • https://vpmemorial.net/images/file/12528228907.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/2037467090.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/43804757099.pdfIn PDF document text
    • http://lblussana.it/images/file/mosinasimozakan.pdfIn PDF document text
    • https://sealskinz.ru/files/file/pololonojigonag.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f88ef188c---foded.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/xulawozufuzonawitenem.pdfIn PDF document text
    • https://dm288.com/slicice/file/31008301112.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/romisuxiwav.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/10475431697.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/tifuzebuxagunoz.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133195ddb353---xuvuranapizebogizibino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+formation+of+ionic+compoundsPDF 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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 18380 bytes
SHA-256: ffda9a963fe4576448eb5c624a004a078a48071655523c72ce8c13639006b92f
font_02_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 10904 bytes
SHA-256: fefd390a04c8923a9390dfb4dcb7f15e4d80b73c686c2dfb659dfff3aaa3c415