Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf95f1fdbe09bbee…

MALICIOUS

PDF

75.2 KB Created: 2021-09-22 14:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b30132a243b924776daae2814c0fc948 SHA-1: 572f5dfe24dcda30b9b99b64337d1cdcd1f90091 SHA-256: cf95f1fdbe09bbee5347414b6381bdefa3834817861e8784b8d3a3a0e61102f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this attack pattern. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://laborke.ru/uplcv?utm_term=hitman+2+apk+obb
    • http://nfraccon.org/userfiles/file/daluvunobotubo.pdf
    • https://hnhaa.com/userfiles/tnejp/files/kibivunamim.pdf
    • https://netcsemege.hu/ckfinder/userfiles/files/lonagowatanomevijono.pdf
    • http://pincailight.com/zk/UploadFile/file/2021091916291173499.pdf
    • http://beiwendq.com/data/attachment/file/86043467563.pdf
    • http://tokyoto.pl/UserFiles/file/35233873898.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/relunevoku.pdf
    • http://elitaliaweb.it/upload/file/sirivuvan.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18459c8a2---vanenotikolan.pdf
    • http://logtech.cz/foto/Image/file/65867635186.pdf
    • http://gryfarmerskie.pl/pliki_wyswig/files/fabopujibapipewamo.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7ee027c76a7aa74da2a0a835eec65877/73646406116.pdf
    • http://duocthientam.com/uploads/ckfinder/files/90650241905.pdf
    • https://mr-alian.com/upload/ckfinder/files/faxevo.pdf
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/16732504268.pdf
    • http://targhevaticane.it/userfiles/files/mukuzugowudulafutazixu.pdf
    • http://perilatomsk.ru/ckfinder/userfiles/files/5329731461.pdf
    • http://harnettcountyhba.com/userfiles/file/rotomumuronoporuxu.pdf
    • http://nakajima-ya.com/upload/save_image/files/romejimejowinu.pdf
    • http://15441707.com/data/board/file/20210909122836.pdf
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/27149372939.pdf
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/kadamepelejapojojuj.pdf
    • http://thegioioto.store/upload/files/zuzekaborowa.pdf
    • https://izyskately.ru/foto/ck/files/99612737058.pdf
    • https://allmassage.net/upload/file/20210917022426.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_off0000c3b6.bin
0fd333154497f8b1c94f67569c9529a9c82843a823f7937eb336331115248d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B6 17204 bytes
font_01_sfnt_off0000f051.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 16792 bytes
font_02_sfnt_off00010868.bin
01f8f8eb75d2bbde7536e7757be311e0aef1e0c3af96381cf5ef945f0417eac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 10308 bytes

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