Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a7b641ec18b93d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 04:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a26131c60ded59d89949241754138f0 SHA-1: 5e7632ff9a9d5db3ae6884af0c9e4d670600b19f SHA-256: f9a7b641ec18b93dd2f4e93483d462d5c4f54992a001aca1b16eb39e03c765fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The PDF structure and embedded content suggest it's part of a link farm designed to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://contrast.no/ckfinder/userfiles/files/nadiru.pdf In PDF document text
    • https://rheinfurth.de/userfiles/file/78716896302.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/91368461191.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/2296262508.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9035519ff---zopoxowizunevo.pdfIn PDF document text
    • https://avflash.nl/upload/files/sosoxemafonivilibegi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/13nl9thoet1bpm7u6r81100one/pilavixifoxi.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/wosatemufu.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/55714890881.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/71552961315.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/26686460310.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/73977425870.pdfIn PDF document text
    • https://kildevangen.dk/files/tegiludojenizewadesi.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/10134949026.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/zubusodofatifasosilu.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/88871444404.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109040308333336.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/79314111102.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/51387138389.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/xivovavolokemakabu.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/36118188382.pdfIn PDF document text
    • http://prmakeup.com/Image/files/gesavawinebevovasifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=redmi+note+9s+update+miui+12PDF 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_off0000dac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 16880 bytes
SHA-256: e473954c9e2004c84143e92b945466e8eda65fa3ccc4d73bb09a7ed5d5e71338
font_01_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 10892 bytes
SHA-256: c7067ca0bf5b969e3a34598b750f4cd19d0294a5c77be14338ba6ad2693930c6

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