Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c359ac4fda1df33…

MALICIOUS

PDF

88.3 KB Created: 2021-09-17 03:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89176c36bab269f96a78e4402f33785a SHA-1: 96605a5ea2f8b4803f9959d2c2592acbbafb9a72 SHA-256: 8c359ac4fda1df337cac8ef8259783cee646a01ea1fa631e8b27a49ca16276a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the PDF's purpose is to act as a link farm on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://smidgel.ru/uplcv?utm_term=the+burn+journals+pdf PDF link annotation
    • https://bloomlight.pl/_bloom/file/74890635705.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/fenililajurosokifevad.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/naxos.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132bff7da6b5---7053682269.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/peparisewumegagodegeliven.pdfIn PDF document text
    • http://eternoohydro.com/d/files/votejajesolaradoredo.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/losusuvos.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/taxuvuwejagimolaxaviwux.pdfIn PDF document text
    • http://skupka54.ru/upload/m/jufuxokobodesoxaga.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/diwofujanolilisalumiti.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/14658079041.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/33781339610.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/vumogox.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/79006829696.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/11994072506.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/66976670777.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210914012653280108v7x5t6.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/kaxowuz.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/fusugupazibifowidanesilid.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/3854473427.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109131549599305.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/sixovi.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/tumikakaseposeki.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/5b3f537b88b5466b82d8ecf2a9d01317/9302805592.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/vuvezumejebanepepoxozuviw.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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 19232 bytes
SHA-256: 01ae85160d02cd62c5b70b3212ab19605d2f7d4088ec59f680ee96387d857a05
font_01_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 10736 bytes
SHA-256: b5b264537815cc4fd40f27bfeff37d258f16fc5cd2c962abc8d6b8eb635b0980
font_02_sfnt_off00013b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1