Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8b6043d3a8f3fc…

MALICIOUS

PDF

82.3 KB Created: 2021-11-12 06:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: db7734976a71263823c742f83ad8bb42 SHA-1: 42a799c5ba87a80b7dbde99afe527d5956b60c7f SHA-256: 4c8b6043d3a8f3fc0fb1c5dcbd9893fce77ad26db1d4dab2bee8da197c76c745
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a PDF link farm with numerous external URIs, suggesting it's used to redirect users to other sites. The presence of a link farm with many distinct hosts and a 'utm_term_redirector' flag points towards SEO manipulation or a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://ficfart.org/userfiles/file/72944270480.pdf In PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/sigujadiked.pdfIn PDF document text
    • http://hakemokulkiyafetleri.com/upload/ckfinder/files/94417127838.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/ledudowuleki.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/14096357217.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/tamugaj.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/41230815975.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/lakavuwinipifujeguv.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/16604119883.pdfIn PDF document text
    • http://soupworld.de/upload/file/23744275169.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/83581241613.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/pixutujaxudad.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/98742601695.pdfIn PDF document text
    • http://cx-gl.hu/images/files/xuwetebowemilekufafux.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/vabib.pdfIn PDF document text
    • https://arenerachicamocha.sinecsas.com/ckfinder/userfiles/files/sawof.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/pikofemutogu.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/80029520197.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202111081506565406.pdfIn PDF document text
    • http://nprofit.hk/userfiles/14588968703.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HTGXzuRVGb4/uplcv?utm_term=18+adult+full+movie+downloadPDF 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_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 10660 bytes
SHA-256: 9749105dc0afd7cb932c2963107dbeab5a3d9eaf99cd6f47c60dfbce8a26c87a
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 17264 bytes
SHA-256: 23630ee3b8b5dbee4d59643f165b743c514040a194d211e93e0c021f31e2ac8e
font_02_sfnt_off00012481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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