Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cf70e88a6388d1…

MALICIOUS

PDF

71.2 KB Created: 2021-03-17 17:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 95c7e14385915ea3ff390f3e8f198da1 SHA-1: df99dab4e620c2d9a1196c631515c5b578163e99 SHA-256: 18cf70e88a6388d1fc978166bab8c3a1e2fe907616ef83bbcb76ff62a50fccbb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/wix?keyword=ap+calculus+separable+differential+equations+worksheet PDF link annotation
    • https://vifabuwu.weebly.com/uploads/1/3/1/6/131606679/mubomo.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/xemigozudadun.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/patitaxilipejuzibulefam.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/43923121361.pdfIn PDF document text
    • http://kofupum.mygamesonline.org/sabertooth_990fx_r2.0_specs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_6043ba20ccadb.pdfIn PDF document text
    • https://vuguzakinizole.weebly.com/uploads/1/3/4/4/134493236/391004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466408/normal_6033c03b76bc1.pdfIn PDF document text
    • https://femodamokej.weebly.com/uploads/1/3/4/5/134529999/38a9d30651d489.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/felofapopesipowilub.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/wuditogulexisugisiralodo.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/how_to_install_netflix_on_sony_blu_ray_player.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/wovobatupekeluw.pdfIn PDF document text
    • https://mutebomex.weebly.com/uploads/1/3/2/7/132740724/65b3c.pdfIn PDF document text
    • https://zepudelewow.weebly.com/uploads/1/3/2/6/132682561/mowisunemamu.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/cooks_essentials_programmable_pressure_cooker_cepc600s.pdfIn PDF document text
    • https://benokonafininu.weebly.com/uploads/1/3/4/6/134606635/lasewominigabu.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/numegubowalonan/chemistry_of_materials.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/asc_606_and_ifrs_15_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/biriyani_tamil_movie_free.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/5_love_languages_book_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/zabapibamalubudasuduru.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/57519371245.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_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 5652 bytes
SHA-256: 6fd81b3276cc61e026eb71225e79bd82fb332b0d70da9e48cd9f5ad7a5a0f64b
font_01_sfnt_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 10468 bytes
SHA-256: 9b0168554a2536790208c6e8d23b3edbb899ae573b009b62c5e62ca409fe7ccb

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