Malicious PDF — malware analysis report

Static analysis result for SHA-256 673dc2b87bf4c25d…

MALICIOUS

PDF

87.8 KB Created: 2021-04-01 01:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cc567b069b9072326f08a10d9ba3e8a7 SHA-1: b6e8ee5fc0e7f2c4f7d368934e0e1e5c393bf524 SHA-256: 673dc2b87bf4c25d507974d1c4a3fcad788328d684874ae44cad944d11cd67fd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing or trojan variant. While no scripts were directly extracted, the nature of the link farm suggests a malicious intent to redirect users to potentially harmful content or phishing sites.

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 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://botokaw.ru/wix?keyword=stoichiometry+worksheet+1+answers+key PDF link annotation
    • https://fudafovagovareg.weebly.com/uploads/1/3/4/8/134868702/roxukitivunaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424026/normal_5fd229a5d60f5.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/dangerous_liaisons_book.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/jurnal_konseling_behavioristik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480743/normal_5fe8ff606b64c.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/ankle_sprain_management.pdfIn PDF document text
    • https://raguwamirib.weebly.com/uploads/1/3/4/6/134630778/1302119.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/aab860bfeb96b.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/3fcbcbf45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446259/normal_6047e9a97d34f.pdfIn PDF document text
    • http://legegapepapo.medianewsonline.com/employment_contract_template_uk.pdfIn PDF document text
    • http://keluzizizeroki.getenjoyment.net/catholic_encyclopedia_vol_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367687/normal_5ff85323177fa.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/85472540873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fe0b6fd18065.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/libro_biocentrismo_di_robert_lanza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_550205e014c04503829f5d63758f3628.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_7be50c1fc2654f1bb471ea41952b9a6a.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_05f2846faa124bf1906851f6ef22ce32.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_de912d80fb4e4e1285441edd530f554a.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_c6c6ab8579794e079472fa190336d4ea.pdf?index=trueIn PDF document text
    • http://bolirazebaf.myartsonline.com/how_to_read_electrical_elementary_wiring_diagrams.pdfIn PDF document text
    • https://a0e9597c-cfbb-4fc1-b0e0-47ed6411b148.filesusr.com/ugd/24269e_63f8068d78a3472189f645e5d3e0bf52.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 5420 bytes
SHA-256: e4b62c5d766bb4b04b0421bbcf28ffbfaf1cae2e3c5dd201931481c289bd490b
font_01_sfnt_off00011390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 11896 bytes
SHA-256: 42bcf4fd8a7b0f5e0c474764faf9281c35d438f820ee97303067b58c886c431e
font_02_sfnt_off00013c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3C 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d

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