Malicious PDF — malware analysis report

Static analysis result for SHA-256 f834d0d4262f7e41…

MALICIOUS

PDF

83.2 KB Created: 2021-04-08 19:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0773ee7b78f12b4552357b22e55b10d3 SHA-1: 5db48cf8b8b7866ea75e4c29399d261f844b76a7 SHA-256: f834d0d4262f7e414399d22e0e7c182b09ac5f7d7bb1e4cb1a7cc77b58e2a917
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=vishnu+sahasranamam+listening PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366665/normal_605f903fd4da9.pdfIn PDF document text
    • http://vashastrahovka24.ru/117406949985f8p2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_6052164d14c63.pdfIn PDF document text
    • http://tehnopolis.org/circupool_rj45_manuals5me0.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/78986659584.pdfIn PDF document text
    • https://vizefibamoraxob.weebly.com/uploads/1/3/4/6/134613498/5a1af.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/carmelo_bene_libri.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/sutemetur.pdfIn PDF document text
    • http://biomaniks.website/proform_smart_995i_reviewslgbkn.pdfIn PDF document text
    • http://businessoutsourcing.info/get_free_annual_credit_report_transunionx5mk5.pdfIn PDF document text
    • https://zogumunatol.weebly.com/uploads/1/3/1/6/131636745/55888eabc.pdfIn PDF document text
    • http://pubggaming.online/6-3_study_guide_and_intervention_sim33s64.pdfIn PDF document text
    • http://ttop-shop.com/old_bridge_high_school_addressv7o1g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_605be7d267beb.pdfIn PDF document text
    • http://digitalmicroteter.xyz/what_kind_of_transmission_fluid_does_a_2008_honda_civic_usexnuw2.pdfIn PDF document text
    • http://options.expert/92254691538q762v.pdfIn PDF document text
    • https://bejasesazopo.weebly.com/uploads/1/3/4/5/134512805/1572053.pdfIn PDF document text
    • https://tiralilibixadu.weebly.com/uploads/1/3/4/5/134500138/teselomujam_wavedasov.pdfIn PDF document text
    • http://ropisunofo.mygamesonline.org/zanetepirogubosejujet.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/laginekux/92784520141.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/horizon_view_7_deployment_guide.pdfIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012755.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12755 6920 bytes
SHA-256: 9aa612aed349f729afe6ea4a5af201a83c5f0a1b8cf9ab1da947f30d1e45e8c9
font_00_sfnt_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 5064 bytes
SHA-256: b6a5f1c623e98a49386a34c0e78841bd332422100a7c819195a9159bed6f444a
font_01_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 10572 bytes
SHA-256: b0de10586eb2744cd29b3ba92a08f44bb4675536a0aa69ac4193937b067ecad8

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