Malicious PDF — malware analysis report

Static analysis result for SHA-256 010f8df107c5e47c…

MALICIOUS

PDF

68.3 KB Created: 2021-09-22 09:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6036a987cbb4d9fa92fef92cf6ce6c19 SHA-1: ec313d5ce0f3419dfd24f94a5df778d388799ba3 SHA-256: 010f8df107c5e47c8af578b9ffde1ee0c11d26421cc19c100910c799f7d4769f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it's likely a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=fm+2020+download+android
    • https://kanat.com/upload/ckfinder/files/pufovasumiv.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614509c334094---vomobirewozogafovufu.pdf
    • https://ismet.com.br/ckfinder/userfiles/files/tarefodinoratogelameg.pdf
    • http://sva-jeanroze.com/xmedia/file/30926666486.pdf
    • http://ketoanantamhcm.com/uploads/files/migaguwiremolopeke.pdf
    • http://healhumanity.foundation/userfiles/file/rujes.pdf
    • http://flyingwedge.com/uploads/assets/file/43367144519.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/guzuwebomizukega.pdf
    • http://uniquecharacters.com/upload/files/27349098644.pdf
    • http://bjsddesign.com/filespath/files/20210922003829.pdf
    • http://sahcarpets.com/userfiles/file/4466853693.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/punazutuxad.pdf
    • http://aerotechgroup.ru/img/outer/files/jokovuvu.pdf
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/45569186388.pdf
    • http://studiotecnicomancini.eu/userfiles/files/papimafawovid.pdf
    • https://idd.no/ckfinder/userfiles/files/27474814260.pdf
    • http://happyorderfood.com/uploads/files/bosipiliragibopi.pdf
    • http://farmaciafici.com/userfiles/files/noxovowumedotebulidagi.pdf
    • https://aimhc.com/userfiles/file/69330881705.pdf
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/gazafigapazatasekolu.pdf
    • https://knurussian.kr/DATA/upload/files/202109151604049794.pdf
    • https://elperrocallejero.info/ckfinder/files/resusuxu.pdf
    • http://nghiencuuykhoa.com/uploads/userfiles/file/mewozutoj.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_off0000b0c5.bin
890c37a5b6b2e27bbe7ef0c1f2dcbb6b8a22a992650396361e5ad819b9059f49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C5 10316 bytes
font_01_sfnt_off0000c7f6.bin
be025b99d6af76322ccce949bbb4b381601ae9a6cff5e8f15ebb554c271ff363		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 14240 bytes
font_02_sfnt_off0000eb92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 16792 bytes

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