Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8917fd84e99a5b9…

MALICIOUS

PDF

76.0 KB Created: 2021-03-24 01:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2ba55419dc9c26990e089e91a65d101 SHA-1: 1f48b58f69b40cdfb46487991c6b049e397f7a9e SHA-256: d8917fd84e99a5b96521dcc5f9012818fb5af89e41386d0e29e2c54aeb096c07
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with at least one, https://ponafet.ru/wix?keyword=porter+stansberry+2020, pointing to a suspicious domain. The PDF's structure and the presence of external URIs suggest it is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/wix?keyword=porter+stansberry+2020
    • http://parovosi.mygamesonline.org/92151374972.pdf
    • http://vbnmcxz.xyz/winifabejodudofujadunimuppxg81.pdf
    • http://ashotik.space/48947518339stxq9.pdf
    • http://honey-love.ru/gokalaxivugesodalalaf0os6g.pdf
    • http://xumegexujarev.22web.org/nuwimixojiwav.pdf
    • http://somubuzesixuwun.getenjoyment.net/mitosis_cell_division_stages.pdf
    • http://dipugipedanam.sportsontheweb.net/adobe_reader_version_9_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pesogulovuxolub.rf.gd/navy_seal_pay_scale_2019.pdf
    • http://fojosotum.myartsonline.com/frise_chronologique_histoire_cm2.pdf
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_078171ee22574cefac5226375afe0a69.pdf?index=true
    • http://riremeg.rf.gd/basic_manual_testing_interview_questions_for_freshers.pdf
    • http://gagonunanu.epizy.com/6066026181.pdf
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_7ed94c24cced49e7b54106cab22e6d67.pdf?index=true
    • https://uploads.strikinglycdn.com/files/be65728f-edfb-46a5-9dfd-893a233a9663/vutedo.pdf
    • http://wafapajof.epizy.com/march_2019_calendar_telugu.pdf
    • https://uploads.strikinglycdn.com/files/f0cd3839-20ae-47db-bc59-ed0723e8a2a7/37750906551.pdf
    • http://savagit.rf.gd/24218976790.pdf
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_ab8074412e534ba6bbf4e379238081a0.pdf?index=true
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_481186f9f977471cbddda66254206ee0.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_off0000e8fa.bin
1ae194c5699b67c3e04d97de64b153a7e6feeb0f07f2773cdbf27deba139f069		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 5164 bytes
font_01_sfnt_off0000fa9c.bin
25b4d136277ff05e3be16d955b1546dfaaae00182d77a69fd461680b7adb1cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 11228 bytes

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