Malicious PDF — malware analysis report

Static analysis result for SHA-256 4353da89c3503358…

MALICIOUS

PDF

72.6 KB Created: 2021-03-24 13:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2e5ed71c4bdc10f3dbc93ae11fe98c21 SHA-1: 5248a6685c861a14fb3a8261fb0358e8fe4b90cb SHA-256: 4353da89c350335837797f0ccfbfa9f8e1f654ec3d70dbe9bd5a2f045a870354
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, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=advantage+of+autocratic+leadership+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368732/normal_60409d76bd4ee.pdfIn PDF document text
    • https://cdn.sqhk.co/wawerugile/ghdF2Fq/brick_breaker_game_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/4xpfibG/48050588241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489596/normal_5fedffc8ab877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ff98be8a22b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_603126b1643b1.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/lirumurelokizinofevefap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481053/normal_5ff28d2976932.pdfIn PDF document text
    • http://jidogirikar.mygamesonline.org/byers_forensic_anthropology.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/nuevos_retos_en_tecnologa_educativa_libro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_f1e8bc812ee545a2959727ae41e794fa.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_fecaa170268d4377bac76d200610f752.pdf?index=trueIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_7962fd5f09a84c70b9fa54355d0ab46c.pdf?index=trueIn PDF document text
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_edc325815cec4604bfa08719238c86ec.pdf?index=trueIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_fae23238a4954b01a30cbd9ca726eb71.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_d74d8d3889bc4abb9e01d934e4158469.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_7fda62db00354dfba0b7c0ea58db4b49.pdf?index=trueIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_9429722282184bfeb6253a58f306f35b.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 5464 bytes
SHA-256: 68dfa21d0fdcc832d2a2c89d1ff75db6feef7a35c6be08c1e9a5e194e2c462a0
font_01_sfnt_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 10332 bytes
SHA-256: 196388f798904e5fa45ef85a2bac42a7652a9e59ed7e01896729f64d3d82f857

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