Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad28b16d8f894b5a…

MALICIOUS

PDF

87.4 KB Created: 2021-03-22 07:11:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c6bb119a510ff6e9fbad736c6a67a1d SHA-1: 3ceed2e87badde99aaea9c75df4bee8f4e4597d3 SHA-256: ad28b16d8f894b5a0313fa0097e30194aac862d12ef698ac5e82320d590b7166
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these domains, lnstagramlivesupportcenter.com, hosts a PDF file, suggesting a link farm or phishing lure. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the file, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://druttle.ru/wix?keyword=did+the+articles+of+confederation+have+3+branches+of+government
    • http://lnstagramlivesupportcenter.com/rezorururowelejixajobumasq9y2.pdf
    • http://inertbhjbj.ru/verobekikivuwejagi8ykm6.pdf
    • https://static.s123-cdn-static.com/uploads/4474992/normal_5ff5c2cae2cb7.pdf
    • http://prosale.company/joss_whedon_wonder_woman_draftid006.pdf
    • http://repair-telefonov.ru/napusavagdnkhw.pdf
    • http://damvglaz0.xyz/rusufib282mg.pdf
    • https://cdn-cms.f-static.net/uploads/4368955/normal_600cdebbf40e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c208ddc4-37ec-4cef-823d-79aeaa8cd68a.filesusr.com/ugd/d34c4d_3834210163eb40cd8f83f3c09449f3f0.pdf?index=true
    • https://s3.amazonaws.com/nigimul/bootstrap_3_form_group.pdf
    • https://s3.amazonaws.com/jevelel/41533059211.pdf
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_ca3364ac22684a4f8045697ade346f53.pdf?index=true
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_50ba179eb654406ea50bff8387d2683c.pdf?index=true
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_fcd63002bebe4874b626c2813cd0fed6.pdf?index=true
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_f42c5c215d9347c0893ff91a74576ab3.pdf?index=true
    • https://s3.amazonaws.com/vuliwisuwig/what_is_operational_readiness_in_the_army.pdf
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_04a81a10aaa5450e80c703bad00ff37c.pdf?index=true
    • https://s3.amazonaws.com/mefonevimimix/bcbs_tx_federal_reconsideration_form.pdf
    • https://s3.amazonaws.com/widuxade/comprehensive_agrarian_reform_law_in_the_philippines.pdf
    • https://s3.amazonaws.com/gapuruxumeg/ritasimu.pdf
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_ded761b9781b413dab23b8c9ced3ba5d.pdf?index=true
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_dd91aaedbca44b5b9676a104b5a24da3.pdf?index=true
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_04925b3eca8d46739e984760f5df5e6a.pdf?index=true
    • https://s3.amazonaws.com/lopadivupudexa/maths_worksheets_year_10_free.pdf
    • https://s3.amazonaws.com/subopukomanaw/ge_profile_microwave_convection_oven_not_heating.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001082f.bin
6fdec033e2bef86892af34eaa30bfbac6b65175c5d13f659a551158ca7f9a8eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 5584 bytes
font_01_sfnt_off00011b06.bin
b5dfac1148380a52530a1c4091be3e7c9df8260e28d2876cc7b8fd8f63bb2cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 11212 bytes
font_02_sfnt_off0001412c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1412C 4324 bytes

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