Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0be43a3789754e1…

MALICIOUS

PDF

76.7 KB Created: 2021-04-08 06:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9d68124b5ddce78e4b72d30295df9e2 SHA-1: 60bbb78af3a11c26107c732fd6475ce4104829b9 SHA-256: b0be43a3789754e12359f4755ac57ada6d257aa07d811b386d25916ea77aaee8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a large number of external links, many of which are designed to mimic search results or document downloads. The primary malicious URL identified is https://midufefew.ru/wix?keyword=chapter+7+section+2+elections+guided+reading+and+review+answers, suggesting a phishing or content-luring attack. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially exploiting vulnerabilities within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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 https://midufefew.ru/wix?keyword=chapter+7+section+2+elections+guided+reading+and+review+answers
    • http://tiktoktop.design/563146574486aa2r.pdf
    • http://reactivaperu-2020.com/819256312834tgn0.pdf
    • https://cdn-cms.f-static.net/uploads/4371814/normal_601431b4c87bc.pdf
    • https://wixilasiniwib.weebly.com/uploads/1/3/1/1/131163505/midaludi.pdf
    • https://cdn-cms.f-static.net/uploads/4462730/normal_6045ef54aa0d6.pdf
    • https://bunixidulot.weebly.com/uploads/1/3/5/9/135964284/95c7f69f07751b.pdf
    • https://cdn-cms.f-static.net/uploads/4460066/normal_6036b787d234e.pdf
    • https://jazexupojofon.weebly.com/uploads/1/3/1/4/131409098/xuvaxa_gupolisam_vivenetamox_samejovubun.pdf
    • http://cyberlife.store/dadagikogilofojoz5hw4h.pdf
    • http://ing-cliente.com/noxuzupixasakepiroxisaxwab.pdf
    • http://gta-msk.ru/do_you_eat_carbs_on_keto_dietc9vtv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_04ee5b8a490c402ab64be4dc6a2941cd.pdf?index=true
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_c15deac8b7f7495da2ccb637e2e726ff.pdf?index=true
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_35bd6dc40b804a6080705a4b0dba01a8.pdf?index=true
    • https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_a46f9a11867f4f18bd59e20391255724.pdf?index=true
    • https://s3.amazonaws.com/lejivugeleguwod/hotel_incident_report.pdf
    • https://s3.amazonaws.com/zozofufulolig/10548608133.pdf
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_f8f4becbb9084349be703a8f8190a92b.pdf?index=true
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_e62fae7430b64caf8866ee5f76078d2a.pdf?index=true
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_c593e67513cb4a0198a9bf917c164942.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef96.bin
4697ea13f11e5e558f3ee331316bca50dda54a261662ff90fc5787cb4a043ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 5604 bytes
font_01_sfnt_off000102b3.bin
b4b3bc70d9a0b180aea2cb62131dce6ad275d5adb2b9d3a01fd0a84062edcc00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 10080 bytes

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