Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bed4ff764c7be4d…

MALICIOUS

PDF

72.9 KB Created: 2021-10-12 21:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d9a4120c271e12a295d1ee7741905bfd SHA-1: 43eee356958aab2e18ea9c3a7bc01f03314289d3 SHA-256: 0bed4ff764c7be4d08c9fad839450538ccde0d245d267fb5d4a1a93c8d5406fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern, indicating a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.sibirprokat.ru/ckfinder/userfiles/files/7357743990.pdf In PDF document text
    • https://subded.org/userfiles/file/42919532047.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/zefale.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/rapowunavusadaduj.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/zeduwo.pdfIn PDF document text
    • http://duef.ru/public/file/94256623171.pdfIn PDF document text
    • http://hnspkjx.com/d/files/turimogotezadazepetud.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/xodekewikosagisiwe.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/lowukubuwezolita.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/26318790889.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/34822983485.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202195101436147.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/36478249518.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f2d66a3bfcb2e1e2beb8260f852dfb86/41615934969.pdfIn PDF document text
    • http://kisito.com/userfiles/file/xurol.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/levevejagikemifatu.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/mugozobizagufemafajokeweg.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210926220008.pdfIn PDF document text
    • http://dsagco.com/Upload/file/perejalulo.pdfIn PDF document text
    • http://soupworld.de/upload/file/53965966079.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/70492542665.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/lobajosudutekijamuz.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/2I9n2o-U8HI/uplcv?utm_term=there%27s+an+old+christmas+cardPDF link annotation
    • 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_off0000baf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF7 16980 bytes
SHA-256: 50f28b61cf233a508992c8511c92093a8a52680b4424fe6a08ab2ac2df4c5f2a
font_01_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 10632 bytes
SHA-256: 2b13d01132cb9a7bae2ef67318d2e1d5cc56960c7cb3d03008d7a0ccd848fa9c

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