Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd57bbf9fd0a0a2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 18:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7002b67463e44d930d73e09a914ec6b SHA-1: d76f96a4ae243038ad5896304636ee6424b7b8b0 SHA-256: 0dd57bbf9fd0a0a291a653840b134223d18896dfa4f68fbe7a13327808bc76a4
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_RANDOM_URL_LINK' specifically highlights a link to a suspicious PDF file, suggesting a download or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://smidgel.ru/uplcv?utm_term=memperkecil+ukuran+file+foto+di+android
    • http://tevukasveza.lt/ckfinder/userfiles/files/52929525754.pdf
    • http://mazraeir.com/images/upload/files/pizozaxadigawijomen.pdf
    • http://gamebonda.com/ckupload/files/41370486435.pdf
    • http://playbabydoll.com/userfiles/file/ferilalubexedolef.pdf
    • http://sbcnepal.com/images/file/wefuvosoga.pdf
    • http://aleshashop.net/uploaded_files/userfiles/files/10800465707.pdf
    • http://abarappresentanze.it/userfiles/files/zezezesinuzeralu.pdf
    • https://alharithiforcameras.com/ckfinder/userfiles/files/sixawevaxetapibovuketazu.pdf
    • http://another-partner.morefriendship.com/upload/files/zuxirelofalazizi.pdf
    • https://ce-mi.pl/uploads/userfiles/files/tafekoj.pdf
    • https://birudongker.com/contents/files/50205975938.pdf
    • http://www.samuitns.com/image/upload/File/xabuza.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/xufan.pdf
    • https://agriplan-rs.com/dados/ckfinder/files/49258538816.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0f2c20031061750b2ee38d85e3d1bd4a/43102692812.pdf
    • https://yaofangpeixun.com/upload/files/goberiwu.pdf
    • http://fine-cottage.ru/userfiles/file/xaxanefikoravafabobogev.pdf
    • http://www.zaluziemalina.cz/userfiles/file/razapoletor.pdf
    • http://3q1p.com/upload/file/210901120025996376dk1cs40sb0gw.pdf
    • http://kuresi-kaitori.com/upload/content_pic/files/27110302626.pdf
    • http://benthanhsgfarm.com/images/uploads/files/jesevogeviw.pdf
    • http://parbatsamajjapan.com/img/files/files/pavuxaveda.pdf
    • http://twtime.com/uploads/files/202109090447058490.pdf
    • http://nowyhotelik.pl/userfiles/file/1898393344.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/53765580958.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_off0000de05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 16792 bytes
font_01_sfnt_off0000f617.bin
67ec53b382a53cfbf3ea947fe578b4c816cdb299e63ead73e7db250b1c297893		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 16932 bytes
font_02_sfnt_off0001221f.bin
759053d705fefb4e4ad48f8798a34fd3b88f8fd3e6407eaa7f637519b9d05c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 10800 bytes

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