Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fb3bf9dfcf7bba…

MALICIOUS

PDF

78.0 KB Created: 2021-02-23 06:19:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6d644b9a0af0b73a146e5d3e721c9eca SHA-1: 10cc6a8f705a9f2b908e3858693b1a3d6df52d8b SHA-256: f6fb3bf9dfcf7bba0a77d802a8756fee67afd530e9c4ba6bb6c639d74bec743c
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 0.9998

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://baarspo.ru/wix?keyword=wifi+tether+router+apk+uptodown PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382780/normal_5fe04220364ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_6014438e2d8ab.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/oggDThc/uncommongoods_shattered_glass_ceiling_necklace.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/vuxakarumulek.pdfIn PDF document text
    • https://cdn.sqhk.co/bepifopid/s6ifMie/62525146504.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421058/normal_5fe59ff9db069.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/ajchjib/kipimi.pdfIn PDF document text
    • https://dapadode.weebly.com/uploads/1/3/4/6/134646205/jetuz-gusulaja-zufisakagexuwig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414172/normal_5fce966187c99.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/egjIlij/perfect_homemade_ice_cream_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/i0iaVhf/under_seat_storage_dodge_ram_1500.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dojiseb.epizy.com/allez_allez_allez_song_liverpool.pdfIn PDF document text
    • http://jisixapuwalim.epizy.com/bienes_y_servicios_con_tarifa_12.pdfIn PDF document text
    • http://rowesatuminef.rf.gd/46555557187.pdfIn PDF document text
    • http://lefajiw.epizy.com/ecommerce_template_html.pdfIn PDF document text
    • http://durevitulo.rf.gd/wefusajozo.pdfIn PDF document text
    • http://weguxuwe.epizy.com/guzafaxiviz.pdfIn PDF document text
    • http://fokozagizek.rf.gd/20232809029.pdfIn PDF document text
    • http://dobategasugano.epizy.com/airdroid_premium_version_free.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
    • 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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 5088 bytes
SHA-256: cf73ec82d85855c5a69a0c34ddd1df2a0f2eb569d7efa6c1161d4305868afbc7
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 9968 bytes
SHA-256: dddd4e960f326fa8ea119be3fe4c8255cfdc34131dd3bccc2e8539a9319ddcd5
font_02_sfnt_off00011422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 16660 bytes
SHA-256: 451a97a76e1cd188b335db18aa59b090969584b10ed985ec5dcca0b5cdb1d7ae

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