Malicious PDF — malware analysis report

Static analysis result for SHA-256 1943f7fbccab2853…

MALICIOUS

PDF

76.8 KB Created: 2021-06-12 00:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8c48be390fd74b15e5891b69413d17cd SHA-1: 872e64ab74b6ade4f8f24e026bd7251ed97009ce SHA-256: 1943f7fbccab285380befe589db76eca46c8cd544a0388d572b815da6f9a75fe
186 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 ClamAV and 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 0.9996

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://seumenha.ru/123?utm_term=english+test+level+pdf PDF link annotation
    • https://tavikumor.weebly.com/uploads/1/3/4/4/134476146/5407571.pdfIn PDF document text
    • https://mosufewo.weebly.com/uploads/1/3/4/6/134685447/1768187.pdfIn PDF document text
    • https://taboloralo.weebly.com/uploads/1/3/2/7/132741194/1453773.pdfIn PDF document text
    • https://fusewire.weebly.com/uploads/1/3/0/7/130776481/zaromijevikap_gilitagejuro_voxonolonari_radujadewum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_602d2be88a356.pdfIn PDF document text
    • https://kixisulik.weebly.com/uploads/1/3/2/7/132740480/7410498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_6038fa659d335.pdfIn PDF document text
    • https://lizameguxif.weebly.com/uploads/1/3/1/6/131606128/3205294.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403684/normal_5fcd2ddaa29a7.pdfIn PDF document text
    • https://romarifekaxa.weebly.com/uploads/1/3/2/6/132683260/55eee129a5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393515/normal_60bd1f32db17e.pdfIn PDF document text
    • https://sotasoniwolog.weebly.com/uploads/1/3/1/6/131637806/5e690.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kibumezi.pbworks.com/f/need_for_speed_underground_rivals_psp_iso.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/f/rejawakibizegipokibi.pdfIn PDF document text
    • http://raravisu.pbworks.com/f/how_to_make_your_own_graph_on_google_docs.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/f/music_composition_techniques.pdfIn PDF document text
    • http://kinuwibe.pbworks.com/w/file/fetch/145160202/belogenatoxinarozuwawin.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/lugejusezaduxikugovutada.pdfIn PDF document text
    • http://jowugaredite.pbworks.com/f/pufolebonotesefuzimikuse.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/f/64890322218.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144437661/chart_of_accounts_excel_template_free_download.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_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 5016 bytes
SHA-256: ebc0c1fcba759b4b697ddfd8896bb4496cb817555094c75f17fa2304e02ec787
font_01_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 10600 bytes
SHA-256: 15dd9689f88f7d584bab3a2ca9b4038f3bf5a19829c84f49f8fe475ede4824fd

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