Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d158c97d39947c7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-24 05:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 655c7e1a61fe4503d32e8e313e8a9dcd SHA-1: 68c4a5b0fe2b4daf3fc58a0c0e934b85259866f0 SHA-256: 9d158c97d39947c752fe949f87ce671c7a288ae12fbd84066f234aa60f940908
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The presence of multiple URLs pointing to potentially malicious content reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=good+text+messaging+apps+for+android PDF link annotation
    • http://ventss.ru/userfiles/files/mapizapanekawa.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7cc1dbf2c8fbe942f8dceff494e7f206/16437138106.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/nilodarik.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/mogivisufeva.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/7310385968.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/bebirazixomaxe.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/gubib.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/55689040196.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/16354536334.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/mefigalaz.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/jatuzus.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/754949662.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/86331568562.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/sikosegawo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/0478451558.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/24335533861.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/rebopepirevetikudiki.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/10777797747.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/84027835668.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/56378589654.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/97484276265.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092321230910.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/63818906218.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9034311df---88145415936.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/45775633460.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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 18176 bytes
SHA-256: a471b84a8fab7de33253efffb7705081d1f5d1ce4ffa3d76bde0f925111ea02f
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 10936 bytes
SHA-256: 604757d60f8a1c9b77791a41ad70b04b31fa6727f633a14cde618d492363c590

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