Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5c98bc4f2319a8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 08:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76a5f7df2568d51cfbe3c8d9453f202b SHA-1: ce3b5c45b98854dfce819fa0bab997c8c8297c82 SHA-256: ba5c98bc4f2319a8195260816f1f0e966f3c4eebd2e3a763004c51aebbdbd291
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external PDF files, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ijfbacknumber.com/editor_up/mufojafa.pdf
    • http://stamforgtechnologies.com/uploads/45851203429.pdf
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/kefavixe.pdf
    • http://ozdermusavirlik.net/userfiles/file/susilivogetajizuxusezobe.pdf
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/kijezemolufufej.pdf
    • http://veterinariacomportamentale.it/userfiles/files/73703152560.pdf
    • https://daynexweb.com/upload/ckfinder/files/duleperuvug.pdf
    • http://fsanaq.com/upload/file/21091615123800475834bed0mbb9nb.pdf
    • http://lamorenj.com/userfiles/file/6316610737.pdf
    • http://alompar.hu/uploads/content_files/files/83489546382.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/13004950325.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/s8uo2q5gq1penkg9cg38j8og11/68678380608.pdf
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/buxesimexelamusav.pdf
    • http://partnercable.com/files/11255557273.pdf
    • https://lrsinc.co/userfiles/file/31435758332.pdf
    • https://innotek.vn/uploads/news_file/25735611277.pdf
    • http://kiddeefire.com/media/userfiles/files/62681022400.pdf
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/86967452806.pdf
    • http://kisito.com/userfiles/file/petosedagegivazikozobak.pdf
    • http://bloodfaces.de/attachment/file/4875954979.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614429cecbf37---wepepedoxowiviluf.pdf
    • http://budaikepkeret.hu/uploads/file/81905590419.pdf
    • http://infrabud.eu/fckpliki/file/nunaribuzopitijumolaw.pdf
    • http://greenbrier101.com/userimages/rosere.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=stellio+music+player
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3c.bin
08c2172d3a97b7ec38c582b3e7caa4d794830e6edb3189bd574dafa93f938869		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 17656 bytes
font_01_sfnt_off00010abd.bin
de77e57f67a7cd63beafb7ecbe1a69ae21210f74b81954e836ad3057becee43a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 10720 bytes
font_02_sfnt_off00012369.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 16792 bytes

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