Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a89b2cde73e99a…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 18:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d53f7569bb7d2db09da537f592252567 SHA-1: e33fbb2412a63cf7f46745b44400eda3056b0268 SHA-256: a8a89b2cde73e99abc6debb53f04f7915eb1ef1064b346ff24a9d3db5a554836
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs points towards an attempt to redirect the user to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=demon+slayer+in+cinema
    • http://malifer.hu/upload/file/57088371444.pdf
    • http://www.deopendeur.org/imgUser/file/33596159422.pdf
    • http://kocavietnam.com/upload/files/47390197950.pdf
    • http://miskolciharsona.hu/pictures/file/96439210853.pdf
    • http://jsdarvin.com/files/jerivovokitikaxivisavopax.pdf
    • http://tsrmmessina.it/userfiles/files/70649199113.pdf
    • https://dpt-mh.com/uploads/news/files/zigopodavimipebega.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/93654507102.pdf
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/wedejerodajexemivulegaxi.pdf
    • http://x04ydivan.ru/userfiles/file/60801231660.pdf
    • http://bainihu.com/upfiles/editor/files/69452308380.pdf
    • http://agriturismolescuderie.eu/userfiles/files/muvavelimiroje.pdf
    • https://gotoko.com/cmsv2/upload/files/rubisu.pdf
    • https://nieruchomoscikomercyjne.co/files/file/16481189054.pdf
    • http://transcash.com/ci/userfiles/files/teveto.pdf
    • https://detectiveoffice.net/userfiles/file/robevosofezodame.pdf
    • http://dubilex.com/userfiles/files/fegag.pdf
    • http://sanraimundo.cl/dyn/uploads/file/20540503002.pdf
    • https://underworldgear.com/upload/users/files/55705497025.pdf
    • https://10glazsikeyrosa.ru/file/81126153552.pdf
    • http://itemclinicchina.com/ckupload/files/63267136789.pdf
    • https://malinaionescu.ro/userfiles/file/xubebura.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/80658863441.pdf
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/24736821280.pdf
    • 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_off0000ba1b.bin
cf7c698726fc2f32d3d82e98c311b08cc4c54e4ea6d4724db4493fb8c295013a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1B 17292 bytes
font_01_sfnt_off0000e669.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 16792 bytes
font_02_sfnt_off0000fe80.bin
7ce7a3fcd7f01f3aa0c482f31ef00b5307aabc9821eb6d5becf09596dead3aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 10408 bytes

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