Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b87b632df99fd5…

MALICIOUS

PDF

73.3 KB Created: 2021-02-12 07:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bbc9f550dfcb149ce725350ab07c512 SHA-1: 2376c79bdf7073ab6aaab43ed71f1741518ec1dc SHA-256: 75b87b632df99fd56fb9566b72e04cf350baf2016926d70b7c81b996a371eb8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by a ClamAV detection and an ML classifier. The PDF contains a large number of embedded external links, a common technique for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or direct users to malicious content. No scripts were extracted, but the presence of numerous URLs points to an attack pattern focused on external redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=the+invisible+string+pdf
    • https://cdn.sqhk.co/jamolipa/R1lQjib/great_falls_farmers_market.pdf
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/6c0e83cc4b65943.pdf
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/zisajex.pdf
    • https://cdn.sqhk.co/xafiguzi/egjUh6t/mabofiraf.pdf
    • https://cdn.sqhk.co/pumevigatare/HhiggW8/mustang_cobra_iphone_wallpaper.pdf
    • https://cdn.sqhk.co/mibemofega/gchgicD/batidobetatovaxaravex.pdf
    • https://cdn.sqhk.co/goworonol/89yqGAy/29178669124.pdf
    • https://cdn.sqhk.co/geroterunetu/fibdihE/vazigim.pdf
    • https://cdn.sqhk.co/bozogekeji/kUhigd0/42374052979.pdf
    • https://cdn.sqhk.co/tefaxobaf/gcgjjio/40589699224.pdf
    • https://cdn.sqhk.co/moxibusas/hDiaKhj/toolbox_talks_construction_industry.pdf
    • https://cdn.sqhk.co/ronofumito/hphbhfG/running_on_empty_food_review.pdf
    • https://cdn.sqhk.co/kobewudojuvo/jbSifje/the_trip_to_greece_netflix_uk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/naxizugenabi/67907862931.pdf
    • https://s3.amazonaws.com/geradi/abdominal_aorta_ultrasound_report_sample.pdf
    • https://s3.amazonaws.com/tudawufed/wodasiwotiwabovagufax.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/excel_indirect_function_from_another_sheet.pdf
    • https://s3.amazonaws.com/zamemigojat/zopixusewulepid.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://scripts.sil.org/OFL
    • 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_off0000cc73.bin
ea6722715c01bbe72ea87ff0e26c43f57447d3cdc5a55da6104945cb5d7f8138		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 5244 bytes
font_01_sfnt_off0000de43.bin
b3a9b39bb81350b5109e5002a14a6c732dfa1b4866bad23adc79e703a54e694f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 10424 bytes
font_02_sfnt_off00010209.bin
ffcc099cb313ee7442755751e66ee5b466d1c2ae3a5aa4db1c7e493352985176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 16036 bytes

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