Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0b16bd331f8900…

MALICIOUS

PDF

76.2 KB Created: 2021-09-26 11:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f688a5cf58a72eb2e85e9ea0adc1c844 SHA-1: f78ac82cbd2665d92b8273cb2d50acdbff140ecb SHA-256: 8e0b16bd331f8900e0ecf1cdf95c95c5aeb48c746cdd3f30e895a635d0d1be53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=a+game+of+thrones+book+read+online PDF link annotation
    • http://pastoret.it/userfiles/files/toxuturatiwunepufedubari.pdfIn PDF document text
    • http://africareview.in/userfiles/file/31502697324.pdfIn PDF document text
    • http://medica-brno.com/files/tokeninuzava.pdfIn PDF document text
    • http://my-glc.com/uploads/file/bavom.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210909163120956056.pdfIn PDF document text
    • http://llux.vn/uploads/files/xufediguwata.pdfIn PDF document text
    • https://techlan.pl/files/file/winokakav.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/wimodetimo.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/4332902599.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3666ac4caacd6ad9a33bcf1e4a42dbf8/97587202981.pdfIn PDF document text
    • http://esangsok.com/upfile/files/13688672080.pdfIn PDF document text
    • https://afma.pt/site/upload/file/10562950129.pdfIn PDF document text
    • http://flirdining.com/uploads/files/58427321721.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/6471868717.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/zaviwerefaxatugidukuvi.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93714904025.pdfIn PDF document text
    • http://theponghop.com/upload/files/12431953557.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/73887584284.pdfIn PDF document text
    • http://canadanur.com/resimler/files/jidid.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7730dc2ddc4cc143994bbb2c5c01b225/88661315701.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/25669753912.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/bunujujoforajuzi.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/juxariruxurexowulu.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/85548892958.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/47164449107.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE04 19324 bytes
SHA-256: 92c0828bee04aaad9110275e630c84d015938cf20ecce11e9a9c53c05a23b5a6
font_01_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 11012 bytes
SHA-256: 01c72dfcfe5e85f1f31773e7fc5c1d0afff4d1df1160f78505064dec3fdba9ac
font_02_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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