Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6da3c0cab20443a…

MALICIOUS

PDF

78.4 KB Created: 2021-03-31 14:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7387b931e2c16d849cfc2f1c801bbb59 SHA-1: e23b5fe3afe1331b650a108364c2100deffa057c SHA-256: c6da3c0cab20443ac19cdb2c43a1cd248f661baf93d98c144652033ca5769d3c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs point to various domains, some of which are flagged as disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://xajibur.ru/award?keyword=oxford+atlas+map+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481058/normal_5fd1112106679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_605eee7999a85.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/3iajidZ/bawawobaninibaxu.pdfIn PDF document text
    • http://tamodemuror.getenjoyment.net/konokosobamogarepe.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/installing_application_software.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/2igy5gj/15785321287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_601681962b2d8.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/ihujeIG/open_puzzle_box_walkthrough_level_47.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/M4hehfj/44695576859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409420/normal_5fe0f7e1b90a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_60217602954b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_bf24ef8b81b2471b8006e7a930635e9a.pdf?index=trueIn PDF document text
    • https://a7b5dab3-d5a2-4ded-81d8-576e9851a6d1.filesusr.com/ugd/607883_9a8cc6ee360a480bbdb6673c08f521d5.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_d823a2cfa62a4391bc5796c1c4e1031c.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_b30924f9f1dd4e49ba5126f414465f26.pdf?index=trueIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_254f6148591a4677b9f33802bfef9ee2.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_fbe5bd3b3269438f93b3addbbf5450f5.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_e3e5095a4a4c4407b8339edfd1d7586a.pdf?index=trueIn PDF document text
    • http://dowafirowelumex.atwebpages.com/what_is_the_synonym_and_antonym_of_excel.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_99ffaf3163ec41bca5ef291b1ab1b248.pdf?index=trueIn PDF document text
    • http://desejole.myartsonline.com/why_wont_my_fitbit_charge_3_display_work.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_98fa18469aab49e69695c9541eb2120b.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_ebd282467f544374af5ce44e7b4eb105.pdf?index=trueIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/72728260594.pdfIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_6d29ec041573443bb632dbe6053cf131.pdf?index=trueIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 5280 bytes
SHA-256: ed4f28eaf5824e148e5e0e9ef2820dec56455e6dc00f4bb98dcc0c14dbe41e55
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 11080 bytes
SHA-256: 9055d5041d8b0553541ef440ea2f814456d953ae2cac74aaca65407a86af9397
font_02_sfnt_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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