Malicious PDF — malware analysis report

Static analysis result for SHA-256 23419f55a4508f27…

MALICIOUS

PDF

77.2 KB Created: 2021-02-10 17:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 040968c96c1bfed371d0b00d8f32873b SHA-1: 43e4b56ffccadd2b239ab8ed155c57a8e6093539 SHA-256: 23419f55a4508f276f25b545ea295646efe9e7075fa08f5bc03f600014faffd0
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by a machine learning classifier and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, directing users to numerous disposable hosting sites, likely to download further malicious content. The embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/aws?utm_term=how+to+annotate+pdf+in+google+drive PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487381/normal_5fd3451754223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_601855e6166ce.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/rEhbW3m/pemekevopig.pdfIn PDF document text
    • http://pop-marketplace.ru/mad_skills_bmx_2_unlimited_gold934r0.pdfIn PDF document text
    • https://cdn.sqhk.co/jigixomavola/FMifZhf/86104405229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_601fe05240220.pdfIn PDF document text
    • http://kewujedirolut.22web.org/62423784285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_5fdaf373b7cdd.pdfIn PDF document text
    • http://thelait.pro/bulleya_sultan_movie_full_songndm6n.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/34910877386tfs52.pdfIn PDF document text
    • https://cdn.sqhk.co/rirerujel/Chjspje/city_airport_3d_parking.pdfIn PDF document text
    • http://just-gopro.com/juvugoluxijonelobazutuwuf76i6.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/wnjhdhe/synthwave_goose_blade_runner_2049.pdfIn PDF document text
    • http://jipujitematane.iblogger.org/ctet_question_paper_1_with_answer_key.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/objectdock_2._20_product_key86gf4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/sabulixefiramafiw.pdfIn PDF document text
    • http://bilavefopu.rf.gd/can_you_develop_android_apps_on_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/gajanuvupeja.pdfIn PDF document text
    • http://tovimemiluv.epizy.com/78872053497.pdfIn PDF document text
    • http://tofodubigar.epizy.com/88466238066.pdfIn PDF document text
    • http://kadinox.epizy.com/gokaxorebadudizop.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/42389842251.pdfIn PDF document text
    • http://wesonujojamoga.epizy.com/mandibular_nerve_block_technique.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/13339065076.pdfIn PDF document text
    • http://nokakegobowu.epizy.com/12398504805.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 5144 bytes
SHA-256: ea77867b1e7c5709ec8b789ff40921f8221f3a41a82e170c75635c3823b0fdba
font_01_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 10612 bytes
SHA-256: f3b27701ff36543db5fdcf251fe7cddbfee2cdce81bd57d68573f8ad703d3f7a

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